via The Emperor's Champion on Bolter and Chainsword
Credit to 40k Radio for tons of this info.
https://www.facebook.com/pages/40K-Radio/147396461962884?fref=ts
WARGEAR:
CHAPTER RELICS:
There are 6 different ones.
Two swords, one Bolter, set of armor, one Storm Shield and one banner
They range from 25pts to 65pts.
One Chapter Relic grants a 6+ Invulnerable Save. (It's unclear who benefits from the Save generated by the Relic)

NEW WEAPONS:
Graviton weapons - Have the Concussive special rule, but are not Blast weapons.
Hunter Multi-Launcher (or whatever it is now called) - S:7 AP:2 Heavy1, Armorbane
Stalker's anti-aircraft guns - S:7 AP:? Heavy4
Siege Drills - S:9 AP:2 Melee, Specialist Weapon, Armorbane

CHAPTER TRAITS & SPECIAL CHARACTERS:
ULTRAMARINES CHAPTER TRAITS:
Ultramarines armies may choose 1 of the following three doctrines:
Tactical - The Tactical detachment re-rolls ones, unless they're Tactical Marines, in which case they re-roll all failed To Hit rolls in the Shooting Phase.
Assault - The Assault detachment re-rolls charge ranges, unless they're Assault Squads, Bikes, or Attack Bikes, in which case they get Fleet.
Devastator - The Devastator detachment get re-rolls on Snap Shots and Overwatch shots, unless they're Devastators, in which case they gain Relentless (as long as they're not disembarking from a transport in the Movement Phase).

MARNEUS CALGAR:
Is now 275pts
Is equipped with Artificer Armour by default. May upgrade to the Armour Of Antilochus for +10pts.
Marneus Calgar can take three Warlord traits.
The Armour Of Antilochus - his Terminator Armor - does not prevent him from preforming a Sweeping Advance, and it has a built in Teleport Homer.

VARRO TIGURIUS:
Tigurius is Mastery Level 3.
He knows all Psychic Disciplines.
He can re-roll his dice when determining his psychic powers.
He can re-roll Reserves rolls(even successful ones).
The Hood Of Hellfire is now a Psychic Hood that lets him re-roll failed Psychic Tests.

ORTAN CASSIUS:
5 points more expensive.

CATO SICARIUS:
15 points cheaper.

TORIAS TELION:
Telion has the same points cost.
​Updated with sniper rules for 6th Edition.

ANTARO CHRONUS:
Chronus is cheaper.
He increases the BS of his tank by +1.

SALAMANDER CHAPTER TRAITS:
Get to re-roll any failed Armor Saves from flame based weapons. (Flamers, Meltas, etc, as per page 56 of the Rulebook)
Their flame weapons (Flamers, Meltas, etc, as per page 56 of the Rulebook) get to re-roll any failed To-Wound rolls or Armor Penetration rolls that fail to cause a Penetrating or Glancing Hit.
Any Character gets to Mastercraft one weapon for free.

VULKAN HE'STAN:
Vulkan gives the Mastercrafted ability to Meltaguns, Combi-Meltas, and Multi-Meltas.
Otherwise essentially the same.

RAVEN GUARD CHAPTER TRAITS:
They all get the Stealth USR.
They get the ability to use their Jump Packs in the Movement and Assault Phase.
KAYVAAN SHRIKE:
Shrike can only Infiltrate with Jump Infantry.
????

WHITE SCARS CHAPTER TRAITS: NOTE FROM MR BAKER: I'm playing white scars with ravenwing allies... look at these rules
+1 to Jink saves
Autopass Dangerous Terrain tests
+1 to Hammer Of Wrath attacks
All White Scars units gain the Hit & Run USR, except for Terminators and Centurions. Too good to be true?

KOR'SARRO KAHN:
Khan gives Bikes and Dedicated Transports in the White Scars detachment the Scout USR.
Moondraken inflicts D3 Hammer Of Wrath hits.

IMPERIAL FISTS CHAPTER TRAITS:
Bolter Drill - All Imperial Fists reroll '1s' to hit with standard Bolters. if this includes special ammo... awesome, if not, I'll use Ultras instead
Devastators and Centurions have the Tank Hunters USR and gain +1 on the Building Damage Table.

DARNATH LYSANDER:
Costs +30pts more
Has the Eternal Warrior USR.
Units within 12" re-roll failed Morale and Pinning Tests.

PEDRO KANTOR:
Pedro Kantor makes Sternguard Veteran Squads into Scoring units.

IRON HANDS CHAPTER TRAITS:
All Iron Hands have the Feel No Pain USR on a 6+.
All Characters and vehicles have the It Will Not Die USR.
Iron Hands get a 1+ to Blessing Of The Omnissiah

BLACK TEMPLARS CHAPTER TRAITS:
A Black Templars army may choose one of the following:
"Accept any Challenge, No Matter what the Odds" - Gain the ability to re-roll To-Hits rolls, and gain the Rending USR when you're in challenges.
"Crusaders" - Gain the Adamantium Will and Crusader USR's.
The Black Templars retain their current Ally Matrix.
The Black Templars may not take Librarians.
Black Templars may take Crusader Squads consisting of up to 10 Initiates (i.e. Tactical Marines) and up to 10 Neophytes (i.e. Scouts).
Black Templar Initiates may exchange their Bolters for Close Combat Weapons for free.
A Crusader Squad may purchase up to 2 Power Weapons, if you take a Sword Brother (i.e. the Veteran Sergeant upgrade).

HELBRECHT:
Once per game Helbrect can grant a Black Templars unit the Hatred and Fleet USR's for an Assault Phase.
May take a unit of Honor Guard.

GRIMAULDUS:
Grants the Zealot USR to any unit he joins.
If a unit is within 6" of Grimauldus' Servitors, they gain a 6+ Invulnerable Save.
Grimauldus has the It will not Die USR.
He has Wounds:3 and Attacks:3

THE EMPEROR'S CHAMPION:
The Black Sword (one-handed stance) - S:4 AP:2 Melee, Mastercrafted
The Black Sword (two-handed stance) - S:6 AP:2 Melee, Mastercrafted, Two-Handed
The Armour Of Faith - Grants The Emperor's Champion a 2+ Armor Save and a 4+ Invulnerable Save.
The Emperor's Champion is an HQ choice and DOES take up an HQ slot.
He may be the Warlord.
The Emperor's Champion has Initiative:5 and Attacks:2 (not counting weapons).

HQ UNITS:
CHAPTER MASTER:
Now has Attacks:4 and Wounds:4. Still has Orbital Bombardment. 4 Wounds!

CAPTAIN:
Equipping the Captain with a Bike allows a single 5-man Bike Squad to be taken as a Troops choice.

CHAPLAIN:
There is only one level of Chaplain.
Now has Attacks:2 and Wounds:2.
Chaplain grants Zealot to any squad he joins.

LIBRARIAN:
?

MASTER OF THE FORGE:
Now has the It Will Not Die USR.

HONOR GUARD:
Cheaper.

COMMAND SQUADS:
Can have Bikes
Cannot have Jump Packs
Cannot have Terminator Armor

ELITES UNITS:
STERNGUARD VETERANS:
3 points cheaper per Marine.
Access to Graviton weapons.

TACTICAL TERMINATORS/ASSAULT TERMINATORS:
Thunderhammers & Stormshields cost +5pts per Assault Terminator to upgrade.
There is no way to make Terminators into Troops choices or Scoring units.

TECHMARINES:
No news to report.

ASSAULT CENTURIONS:
WS:4 BS:4 S:5 T:5 W:2 I:4 Ld:8/9 Sv:2+ InvSv: - no invuln will hurt, but for 190 points, that's a lot of damage... need to know how many attacks they get

Unit Size: 3 - 190pts
- May purchase up to 3 additional Centurions for 60pts each

Standard equipment:
- Siege Drills (S9 AP2 Melee, Specialist Weapon, Armorbane)
- Twin-Linked Flamers
- Ironclad Assault Launcher

Weapon Upgrades: (ALL UPGRADES COST BETWEEN 10-20pts)
- Twin-Linked Flamers may be upgraded to Twin-Linked Meltaguns
- Ironclad Assault Launcher may be upgraded to Hurricane Bolters

Upgrades: (ALL UPGRADES COST BETWEEN 10-20pts)
- Can purchase Omniscope which gives Night Fight and Split Fire special rules.

Dedicated Transport:
- They can select a Land Raider as a dedicated transport.

Special Rules:
- Move Through Cover
- Slow and Purposeful
- Decimator Protocols(Can fire up to two weapons in each shooting phase)
- Very Bulky
- Chapter Tactics
- And They Shall Know No Fear

DREADNOUGHT:
No news to report.

VENERABLE DREADNOUGHT:
No news to report.

IRONCLAD DREADNOUGHT:
No news to report.

TROOPS UNITS:
TACTICAL SQUADS:
2 points cheaper per Marine (14pts each).
Access to a Graviton Rifle as a Special Weapon option.

SCOUT SQUADS:
2 points cheaper per Scout.
May take Land Speeder Storms as Dedicated Transports.

FAST ATTACK UNITS:
VANGUARD VETERANS:
Heroic Intervention: Negates the penalty for Disordered Charge and the Sergeant auto-passes Initiative checks for Glorious Intervention.
They CANNOT charge after Deep Striking anymore.
1 point cheaper per Marine.
Jump Pack upgrade is 7 points cheaper per Marine.

BIKE SQUADS:
4 points cheaper per Marine.

ATTACK BIKES:
Possibly 4 points cheaper.

SCOUT BIKES:
No news to report.

HEAVY SUPPORT UNITS:
DEVASTATOR SQUADS:
2 points cheaper per Marine.

DEVASTATOR CENTURIONS:
WS:4 BS:4 S:5 T:5 W:2 I:4 Ld:8/9 Sv:2+ InvSv: -
Unit Size: 3 - 190pts
- May purchase up to 3 additional Centurions for 60pts each

Standard equipment:
- Twin-linked Heavy Bolters and Hurricane Bolters

Weapon Upgrades: (ALL UPGRADES COST BETWEEN 10-20pts)
- Hurricane Bolters can be upgraded to Missile Launchers WOW, so for 200 points, that's 3 ML shots, and 3 TL LC shots
- Twin-Linked Heavy Bolters may be upgraded to Twin-Linked Lascannons
- Twin-Linked Heavy Bolters may be upgraded to Grav-cannon and Grav-amp

Upgrades: (ALL UPGRADES COST BETWEEN 10-20pts)
- Can purchase Omniscope which gives Night Fight and Split Fire special rules.

Dedicated Transport:
- They can select a Land Raider as a dedicated transport.

Special Rules:
- Slow and Purposeful
- Decimator Protocols(Can fire up to two weapons in each shooting phase)
- Very Bulky
- Chapter Tactics
- And They Shall Know No Fear

THUNDERFIRE CANNONS:
Unchanged in rules and points cost.

VEHICLES:
RHINOS/RAZORBACKS:
No news to report.

DROP PODS:
Transport capacity has dropped back down to 10.

STORMRAVEN:
Same point cost.

STORMTALON:
No news to report.

LAND SPEEDER/LAND SPEEDER TORNADO/LAND SPEEDER TYPHOON:
No news to report.

LAND SPEEDER STORM:
The Land Speeder Storm is now a Dedicated Transport for Scouts.

PREDATOR DESTRUCTOR/ANNIHILATOR:
Cheaper.

VINDICATOR SIEGE TANK:
No news to report.

WHIRLWIND ARTILLERY TANK:
No news to report.

STALKER ANTI-AIR TANK:
AV 12/12/10
S:7 AP:? Heavy4
Does NOT have Interceptor. means it can't fire at ground units

HUNTER ANTI-AIR TANK:
AV 12/12/10
S:7 AP:2 Heavy1, Armorbane
Does NOT have Interceptor.

LAND RAIDER:
Passenger Capacity - 10

LAND RAIDER REDEEMER:
Passenger Capacity - 12

LAND RAIDER CRUSADER:
​Passenger Capacity - 16

Strikeforce is the replacement for the Battleforce but instead a "starter army" box built around a theme of some kind. So more of starter box than the current Battleforce is. Every army will get one eventually that will be named after something relevant to that army (example: Wraithhost for Eldar).

240 Points for 3 Centurions with Grav-Cannons/Grav-Amps and Hurricane Bolters. 60 point upgrade for Grav-Cannon/Grav-Amps.

Assault Centurions have Move Through Cover

"Chapter Tactics I got to use that one turn" < Ultramarines CT

Codex: Space Marines is largely in line with Codex: Dark Angels points wise.

176 Pages in their copy of the codex (same as rumored)

Hunter has "Savant-Lock". When shooting at a flyer you put a marker on it for each miss. The markers stay on the flyer until it leaves the table or is destroyed. At the beginning of every friendly shooting phase you roll for those markers. On a 5 or a 6 that missle hits.

Artwook is nice, and book is Space Marines more in a general form. More updated fluff, not just the rehashed fluff.

Some of the classic Black and White was colored, but a lot of new art too.

Book is in sections for each chapter and a large number of the Successor Chapters to help players know who should be using what rules.

Salamanders don't really have any successor chapters because their chapter had suffered a large number of casualties so they have a larger number of Marines in their chapter.

"Equivilant to Forge World background" in terms of fluff.

Forgeworld fluff included in the codex.


Warlord Traits - Only Chart for the Codex
1. Angel of Death - Warlord and his unit have the Fear special rule.
2. Imperium Sword - One use only. Declare that your Warlord is using this at the start of one of your assualt phases. The Warlord and his unit have the Furious Charge special rule until the end of the turn. (Sicarius has this one!)
3. Storm of Fire - One use only. Declare that your Warlord is using this at the start of one of your shooting phases. For the duration of that phase a single frienly unit from Codex: Space Marines may re-roll any failed to-hit rolls.
4. Rites of War - When taking morale tests friendly units from Codex: Space Marines within 12" of the Warlord use his characteristic instead of their own.
5. Iron Resolve - When determining your assault results add +1 to your total if the Warlord is locked in that combat.
6. Champion of Humanity - If your Warlord causes the enemy Warlord to be removed from play in a challenge he scores D3 extra victory points in addition in the usual amount of points given for slaying the enemy Warlord in this scenario. Note that killing the enemy Warlord in a sweeping advance does not reward these extra victory points.


Chapter Tactics

Successor Chapters - You use whatever chapter tactics of your parent chapter is. The ONLY Exception is the Black Templar.

Homebrew - You can pick any tactic you want and use the Special Characters of that chapter. Those characters have to use the same Chapter Tactics as the same Chapter their from.

Allies - "A Space Marine Detachment that has one set of Chapter Tactics MAY ally with another Space Marine Detachment with a different set of Chapter Tactics, Ultramarines and Raven Guard for example. For purposes of the Allies rules these allies are treated as being from two different codexes and are treated as Battle Brothers. Note that you may field models from two different chapters that have the same Chapter Tactics, such as Ultramariens and Praetors of Orpheus in the same detachment. These chapters are so closely affiliated that they count as a single army on the battlefield."

Ultramarines - Combat Doctrine: This detachment can utilize each of the following combat doctrines once per game. To do so at the start of your turn you state which combat doctrine you wish to use, if any, until the start of your next turn. You can only use one combat doctrine per turn.
Tactical: Units in this detachment re-roll ones while shooting, unless they're tactical marines and they re-roll all failed to hit rolls in the shooting phase.
Assault: Units in this detachment can re-roll their charge range. Assault squads, bikes, or attack bikes instead have the fleet rule.
Devastator: Units in this detachment may re-rolls to-hit on snap shots, including overwatch shots, in addition models in this detachment's Devastator squads have the relentless unless they disembarked from a transport in their movement phase.

White Scars - BOTH RULES ALL THE TIME
Born in the Saddle: Models in this detachment with the Bike Unit Type automatically pass Dangerous Terrain tests, and recieve a +1 to their Jink Cover Saves. In addition add 1 to their Strength when resolving their Hammer of Wrath hits.
Fight on the Move: Models in this Detachment have the Hit and Run Special Rule. Note that this does not include models in Terminator Armor, Devastator Centurions or Assault Centurions.

Imperial Fists - BOTH RULES ALL THE TIME
Bolter Drill - Models in this detachment may re-roll all to-hit rolls of 1 made with a bolt pistol, boltgun, stormbolter, heavy bolters, or combi-weapons that are firing as boltguns. This rule does not apply to Helfire, Kraken, Vengence or Dragonfire rounds.
Siegemasters - Models in this detachment in Devastator squads and Centurion Devastator squads have the Tank Hunter special rule and add +1 when rolling on the building damage table.

Black Templars - BOTH RULES ALL TIME
Accept Any Challenges, No Matter the Odds: When engaged in a challenge, Black Templar Characters reroll all failed to-hit rolls, and have the Rending Special Rule.
Crusaders: Black Templars have the Crusader and Adamantium Will Special Rules. In addition Black Templars have access to a special unit called a Crusader Squad.

Iron Hands - BOTH RULES ALL THE TIME
The Flesh is Weak: Models in this detachment have the Feel no Pain on a 6+ Special Rule. Note that if they benefit from more than one instance of Feel no Pain they use the best version available.
Machine Empathy: All vehicles and characters in this detachment have the It Will Not Die special rule even though vehicles do not have Chapter Tactic special rules. Furthermore, Techmarines and Masters of the Forge in this detachment add +1 to their Blessing of the Omnissiah rolls.

Salamanders - BOTH RULES ALL THE TIME
Flamecraft: Models in this detachment can re-roll their saving throws against wounds caused by flamer weapons as defined by the Warhammer 40,000 rulebook. Furthermore, flame weapons used by models in this detachment re-roll failed to-wound rolls and armor penetration rolls that don't cause a glancing or a penetrating hit.
Master Astisan: During the army selection each character in this detachment may upgrade on of his weapons, even one they have purchased as an upgrade, to have the Mastercrafted Special Rule at no additional cost.

Raven Guard - BOTH RULES ALL THE TIME
Strike from the Shadows: Models in this detachment have the Scout Special Rule. In addition, on the first game turn, models in this detachment have the Stealth Special Rule. Note that units that include models with the Bulky or Very Bulky Special Rules do not benefit from either rule.
Wings of Deliverance: Jump Infantry Models in this detachment may use their Jump Packs in both the movement and assault phases of the same turn. Futhermore, they must re-roll all failed to-wound rolls caused by their Hammer of Wrath hits.

COUNT AS: If you want to use Vulkan in a Ultramarines army you have to play use the Salamander Chapter Tactics. So you CAN do "count-as" but you lock yourself into their Chapter Tactics.

Black Templars: + Gains / - Losses
- No More Vows
- No More Marshalls or Castellans
- No More Terminator Command Squads
- No More Master of Sanctity/Reclessiarchy
- Sword Brethren are no longer units
- No More 2 Heavy Weapons in a 5 man Terminator Squad
- No More special rule upgrades (Tank Hunter, ect)
- No More Storm Shields on Assault Squads
- No More extra power weapons in bike squad
- No More Fearless in Close Combat
- No More Righteous Zeal
- Some Flavor
- Most Heavy Weapons +5 more
- No More Power of the Machine Spirt upgrade

+ Chapter Master and Captains
+ Honor Guard
+ Regular Chaplains
+ Master of the Forge
+ Tactical Squads
+ Scout Squads
+ Land Speeder Storm
+ Vanguard
+ Sternguard
+ Ironclad Dreadnoughts
+ Centurions (Assault and Devastator)
+ Scout Bikes
+ Devastators
+ Whirlwinds
+ Hunter
+ Stalker
+ Land Raider Redeemer
+ Crusader Squad keeps Land Raider Crusader as a Dedicated Transport
+ Initiates are 5 points cheaper (counting Frag and Krak Grenade upgrades)
+ Sword Brother option in Crusader Squad
+ Keep Initiate Power Weapon/Fist option
+ Neophyte leadership increased to Ld 8
+ Neophyte Shotguns S4
+ Crusader Squad keeps Pistol and Chainsword option
+ Crusader Squad Organization stays the same


Special Characters:
Marneus Calgar:
- 275 Points
- Artificer Armor standard (2+)
- God of War: May use a single Combat Doctrine twice per game
- Titanic Might: Re-rolls all armor penetrating hits in close combat. He may reroll glancing hits to attempt to get a penetrating hit. Must accept the second roll even if it is worse than the first.
- Warlord Trait: Rolls 3 times on the Warlord Table, rerolling doubles, and chooses a single Warlord Trait.
- Weapons and Ammo still the same. Terminator Armor still has Frag and Krak Grenades. Retain his Teleport Homer.
- Terminator Armor is 10 points and doesn't prevent sweeping advances.


Captain Cato Sicarius:
- 185 points
- Surprise Attack: +1 to Reserve Rolls
- Weapons still the same
- Battle-forged Heros: Pick a Tactical Squad and they gain Counter-Attack, Infiltrate or Scout.
- May still use the Coup-de-Grace with his sword.
- Warlord Trait: Rites of Battle

Tigirius:
- 165 points
- +1 Wound
- Master Psyker: May re-roll any or all of his rolls to choose which powers he knows. He has access to all the powers.
- ML3
- Hood of Hellfire: Psychic Hood that allows you to re-roll failed psychic tests
- Rod of Tigiruis: Same as before with the addition of Soulblaze
- Gift of Prescience: If your army contains Tigirius you may choose to re-roll reserves and apply the result to units of the same attachement.
- Warlord Trait: Storm of Fire

Cassius:
- Zealot
- All equipment the same
- Warlord Trait: Angel of Death

Telion:
- Chapter Tactics Ultramarines
- Same points cost
- Same rules

Sergeant Chronus:
- -20 points
- +1LD
- His vehicle gains It Will not Die

Khan:
- -35 points (bike is still 20 point upgrade)
- Bike does D3 Hammer of Wrath hits
- Furious Charge
- If Khan is your warlord friendly models with the Chapter Tactics White Scars special rule that are bikes or have dedicated transports have the Scout special rule.
- Khan makes all bike squads who are 5 bikes or more count as troop choices.
- Warlord Trait: Champion of Humanity

Vulkan:
- The Forgefather: If Vulkan is your warlord, all meltas, multi-meltas and combi-meltas in this detachment become twin-linked.
- Lost Digital Weapons
- Warlord Trait: Iron Resolve

Shrike:
- 185 points
- Stealth
- Before deploying Shrike can only join a Jump Infantry unit
- Lost Fleet
- Weapons stayed the same
- Warlord Trait: Angel of Death

Lysander:
- +30 Points
- No more Bolter Defenses
- Icon of Obstinancey: All models with the Imperial Fist Chapter Tactics re-roll failed morale and pinning checks
- Same wargear
Warlord Trait: Champion of Humanity

Chapter Master Pedro Kantor:
- +1 Attack
- Oath of Rynn: If Chapter Master Kantor is your Warlord all models in Crimson Fist detachments have the Preferred Enemy (Orks) Special Rule. Furthermore, all such models within 12" of Kantor have +1 Attack while he lives. This bonus does not affector Kantor, and is not cimulative with the similar bonuse that the Chapter Banner gives.
- Still has Hold the Line: Crimson Fist Sternguard Veterans are scoring
- Same Wargear and points
- Warlord Trait: Iron Resolve

Helbrect:
- 180 points
- +1 WS
- Rites of Valor - Gone
- Crusade of Wrath: Once per game, during the Assualt Phase, all models with the Black Templar Chapter Tactics gain Hatred and Fleet until the end of the phase.
- Sword of the High Marshalls is the same
- Legacy of Dorn (+D3 attack on the charge) same

Grimaldus:
- 185 Points
- -1 BS
- +1 Wound
- -1 Attack
- It will Not Die (replaced "Only in Death Does Duty End"
- Zealot
- Relics of Hellsreach: Any Black Templar of a servitor in 6" gains a 6++ Invunerable save.
- Unmatched Zeal: Black Templar models within of 6" of Chaplain of Grimaldus have the Zealot special rule.

Emperor's Champion:
- Uses HQ Slot
- 140 Points
- 2+/4++
- Black Sword: AP2, Mastercrafted
- Combat Stances:
Smite the Unclean - +2 Strength, Black Sword is two-handed and unwieldy
Slay the Heretic - Rolls of 6s to wound are Instant Death
- Bolt Pistol gives extra attack (unless using Smite the Unclean)