I have been looking through the the pictures from Games Day
UK and although they are a bit bury on some of them I have been reading and a few things got me excited.
We now have assault cannons

I think they are only for Obliterators but still, 3 Obliterators firing 3 assault cannons can be extremely devastating.
That hades autocannon looks amazing and especially when the forgefiend can have 2 of them

8 strength 8 shots at
ap 4 pinning.
From what I could read possessed have gotten better. At the start of each sub-fight phase they roll on their table, they can get re-rolls to wound,
ap 3 or +1 attack and +1 initiative (hard to tell but I think it says initiative) this seem to make them worth using.
We now have access to thunder hammers, I am going to assume that terminators will get them.
Daemon Princes even though they go a points increase to 145 their state line is worth it. And unless I am reading it wrong they are now
WS 9 I 8 and now have a base of 5 attacks.
The power scourge look really cool S 8
AP 2 and that flail rule, OMG I want one.
Plague marines are poisoned in close combat and against most things get re-rolls to wound.
Terminator champs are still characters so that's still a plus considering wolf guard and all that lost there character rule.
The Baleflamer looks really cool, its like a vamped up flame storm cannon.
The ectoplasma cannon is a strength 8 plasma cannon with 24", I am unsure of what unit will get that.
Ahriman have 5 wounds now that's pretty intense.
Another thing that looks cool it the ability to buy up to 3 mastery levels on daemon princes, most likely the same for the sorcerer.
Noise marine sonic blasters are salvo 2/5 thats a lot of shots.
I stop rambling now, but what do you fellow chaos player think of the new codex so far.
IXLoiero95XI