Point Cost Changes of units are indicated in their entry. Other changes:
Plasma Pistol: 10 Points
Taurox Prime: 70 Points (+5 gatling, +10 Missile launcher, Volley/Autocannon remains for free as in codex)
Other Taurox options: Camo Netting down to 10 pts, augur down to 15.
Chimera is added to dedicated transports. 55 points base. Options as in IG codex.
Valkyrie cost is unchanged, BS4.

Order System is divided in Senior Officer and Junior Officer Orders. Seniors (Like the Tempestor Supreme) start the turn sequence of orders like in the IG codex,
and have access to Senior Off and Junior Off orders. Juniors (like the Tempestor Prime) have access to Junior Officer Orders only and can start to give orders after
the seniors. See Chain of Command in the IG codex, works the same way (CCS give orders before the PCS).

Senior Officer Orders:
Bring it Down! Unit gains Monster Hunter and Tank Hunter.
Fire on my Target! Unit gains Ignore Cover
Get Back in the Fight! A grounded/falling back units immediately gets up/regroups
Smite at Will! Unit gets Split Fire
Take position! Unit can run or go to ground after shooting.
Aim for the Sky! Only to Tauroxes and only if the officer has a Vox Caster. If the Taurox is equipped with Cyclone or HK Missiles, such weapons gain Skyfire.

Junior Officer Orders:
Directed Firestorm Sanctioned! - Unit gets twin-linked.
FRFSRF Hotshots gain 1 additional shot, Volley count as stationary (4 shots).
Autonomous Fire Sanctioned! Unit gets Preferred Enemy.
Take Aim! - Ordered unit gets Rending against an enemy MC/Vehicle.
Advance on Target! Units gets Crusader and Fleet
Suppression Doctrine Sanctioned! - Unit's hotshots lasguns fire 1 shot, gain 6" range, sniper, pinning, cannot charge

The Chain of command (the order in which the Orders are given) is the following:
Tempestus Scions CCSs
Lord Commissars
Tempestus Scions PCSs
Commissars

Tempestus Scions CCS
Is a Militarum Tempestus Command Squad, as in codex (option for 4 special weapons, as in codex), with the following changes:
Point Cost: 85 points
2 Senior Officer or Junior Officer orders/turn. Range 18".
Med-pack is 10 points.
Clarion Vox is valid for orders, too (so, leadership 9 to unitis within the range of 18").
The character is a Tempestus Supreme with 3W.

Dedicated Transports: Taurox Prime, Chimera, Valkyrie

Commissar
As for Tempestus Sscions codex, but with the additional rule:
Enforce Mission Aim: the commissar can choose 1 order from the Junior Officer list and use it on any units of the same detachment he is attached to. If the Commissar is upgraded to Lord Commissar, He can select a Senior Officer order instead. The order cannot be changed during the battle. The commissar can use Summary Execution to enforce the order (you cannot reroll twice rolls, so does not stack with the Vox Caster).

Tempestus Scions Stormtroopers Platoon
Is a platoon, as described in the IG codex where the scions are an Elite choice.

*1-3 Tempestus Scion Squads (They still get 2 special weapons/squad) , as in codex, with the following changes:
Point Cost: 65 points, +11 pts/Scion up to 10 Scions
Dedicated transports: Taurox Prime, Chimera

*0-1 Tempestus Scion PCS
It works like the Militarum Tempestus Command Squad (4 specials/squad), same stats, with the following changes:
Point Cost: 75 points
1 Junior Officer order/turn. Range 18"
Med-pack is 10 points.
Clarion Vox is valid for orders, too (LD9 within 18").
The character is a Tempestus Prime with 2W (as in codex, I write it here for clarity).
Dedicated transports: Taurox Prime, Chimera

Tempestus Scions Infiltrators
Is a Tempestus Scion Squad that loses Deep Strike and gains Infiltrate.
Same options of the Tempestus Scion Squad, but no dedicated transport.
Cost unchanged (65 base + options, included add up to 10 scions, 11 pts/model).
The squad has the possibility to take Sniper Rifles for 2 points as special weapons.
The Squad can be equipped with an Homing Beacon for 10 points.

Tempestus Scions Incursors
Is a Tempestus Scion Squad that loses Deep strike and gains Outflank.
Point cost unchanged (65 base + options, included add up to 10 scions, 11 pts/model).
The only dedicated transport can be the Taurox Prime, that can outflank if carries the Scions.
The Squad can be equipped with an Homing Beacon for 10 points.

Valkyrie (see codex), but is BS4

Vendetta Gunship (see IG codex PEW PEW)

Tempestus Scions Demolition Team
Is a Tempestus Scion Squad that can be selected only in a detachment in which a Militarum Tempestus character is the Warlord.
Point cost unchanged (65 base + options, included add up to 10 scions, 11 pts/model).
For special weapons (2 per squad), the squad can select:
Heavy Flamer for +10 Points
Demolition Charge for +20 points.

Vulture Gunship Forge World one, no changes. BRRRRRRRRRRRRRRT

None, Take a knight if is the case.

Work In Progress - let's discuss the rules first.

The following changes were made to weapons but were amended.
Plasma Gun: 12 Points
Grenade Launcher and Flamer: 3 Points
Melta, HSVG : 8 points
Power Weapon: 10 points
Power Fist: 17 points
Heavy Flamer for +7 Points
Demolition Charge for +15 points.

Solution A: I will leave HQ and Platoon Troop as the only choices. Stormies lose Deep Strike by default and gain the Mission rule. Each CAD can, collectively, select its Mission, 5th edition style, and such Mission can be: (1) Deepstrike with rerolls (2) Infiltrate (so with Outflank) (3) Ride of the Valkyries (units embarked in Valks reroll their reserve rolls), (4 - added now) the units gains access to demos and heavy flamers.

Solution B: As Solution A, but on a per-unit basis: each unit in each CAD chooses the mission. Clunky? Is just the deployment mode, is easy to track.