Battlefleet Gothic: Armada 2 has in the base game:If they include all the major xenos races I'll buy the game just for having the ambition to do that. I can't think of a single game besides Dawn of War I that did that, and they had to do it in installments and still missed the 'nids.
-Empire (Divided in Navy, Astartes and Mechanicus each one with different ships)
-Chaos (With a subfaction per god)
-Eldar (Corsairs and Craftworld)
-Dark Eldar
-Orks
-Necrons
-Tyranids
-Tau
Also has a bitching soundtrack, memorable voice acting and the four campaigns are what-if scenarios that change the galaxy forever.