In all of the AOE and AOM games there were a bunch of playable civilations. In fact, in every RTS I can think of there are at least 4 civs... I can only think of three for HW. Humans, Covenant and Flood... We know humans will be playable, I mean, duh. What about the other two? I know the covenant would be awsome, but I think the Flood could be really cool too... Just think about controlling hordes of infected soldiers. That would also bring a really interesting gameplay type to the game, infect the enemies armies. That would be awsome.
Then again, I have no idea how the flood would fit in the storyline. The novels/games never mentioned anything about the flood before MC discovered them on Halo...
Ideas? Comments?