There's some speculation regarding the BA side of the box.
It's difficult because there is no comparable kit to the greyhunters/bloodclaws for BA so its a matter of determining if they are going for model count parity or model cost parity. The bloodclaws kit is only 5 bucks more than the DC kit so you can't really justify a second kit like assault marines or sanguinary guard. We shall see I guess.
Personally, I suspect they are going with 5 DC, 5 assault marines, the dread and the captain. I've heard other say they were going to do 5 DC, 5 sanguinary guard, the dread and the captain which sounds equally as plausable.