Last year during E3, THQ and Relic unveiled an action game set in the Warhammer 40k universe. It was called Space Marine, and by all accounts it was Dawn of War 2 from a 3rd person perspective. The preview at the time hinted very strongly at co-op in the game, and while we're still no closer to finding out any details, we do have the first screenshots from the game.
All I can say is... "Yes please!"