>>723147694
Orks because they are 11th Edition main villains
Necrons because they are hinted at strongly already and turns out that artifact in question is of Necron origin
Chaos Undivided because it would be trivial to make them even now out of assets that are in SM2 already
Tsons and Nids will be ported alongside all other possible stuff like Operations, just like such features were ported in L4D and Vermintide cases