With that said let us get started.

Troops choices will be Chaos Space Marines and Cultists
All Cult Marines are Elites
No new Special Characters
Special Characters will unlock Cult Marines as troops (Kharn for Berserkers and so on)
Typhus makes Cultists into Zombies
Chaos Dreadnaught is removed and replaced with a new unit (like how pariahs were replaced with Lychguard)
CSM now get a Flyer a Mechanical Chaos Dragon (model is done will be part of initial release)
Lesser and Greater Demons are gone
Spawn replaced by “Fell Beast”

I feel like I am missing something…

Oh yeah…
Almost Forgot...
Rules for Traitor Guard are in!