Would love to see the Sons of Malice, even though they don't ally with any of the other war bands. I can dream right? Other than that I would like to see The Purge
My vote is for the Alpha Legion. I love the Death Guard, but I believe it should be kept to Chaos Undivided Legions.
There are so many possibilities to do considering the Thousand Sons, and I do mean MANY. Plus the imagery of the Thousand Sons is too good to not have it in this game. And a majority want's to play Chaos sorcerers.
Actually if you were to browse the thread made specifically to deal with class popularity you would see that Sorcerors are faaar from what everyones dying to play.
Why the hell would that sadden you? If you like the sorceror and want to play (like myself) it its the best thing one can hope for. There wont be like 1213153131 of us around. It means people are choosing what they like, not whats considered overpowered. Which again leads to devs looking into fleshing out the class itself and making it a non hero one (they did confirm in the AMA non hero pyskers are gonna be ingame just not which race, so fingers crossed).
They love to dismantle their foe without them aware of them even eing there but they will fight if need be