Apparently because I triggered a lot of rage and bashing from the Thousand Sons Facebook page, I guess I need to clarify that I'm exaggerating. Obviously I don't think this is imbalanced and I'm not whining about Slaanesh being overpowered. We'll still dominate the psychic phase (even if they field 3 of these dudes, they can only Deny the Witch 3 times)...mostly. I hope. In any case, I'm happy to play against Slaanesh Daemons. I'm just hoping the followers of the god of magic gets similar casting and deny the witch bonuses, that's all. And can you imagine how awesome it would be if All is Dust allows us to shrug off mortal wounds on a 2+? It would mitigate Perils on our Aspiring Sorcerers and not bomb the entire unit!
In any case, you can check out Warhammer Community for more details. I'm surprised Natfka has not posted on this yet on his Faeit212 blog, but he will. Eventually. For now, you can make do with this link and check out the new Keeper of Secret, Whoever Hellbane and other Slaanesh Daemons stuff. Not my cup of tea since my allegiance is to the Emperor first and Tzeentch second, and Thousand Sons over Emperor's Children. I didn't like Fulgrim, honestly, and was mindblown when I read A Thousand Sons by Graham McNeill - those two stories were like night and day. You can tell I love the Thousand Sons and their lore a lot more.