THQ and Relic were mostly showing Space Marines versus Orks in previous Warhammer 40k: Space Marine assets, but today, that changes with the introduction of Chaos. Oh yes, they're plopping the forces of Chaos in the single-player campaign. You know what that means: Chaos Marines.
Captain Titus of the Ultramarines might think the Ork invasion is the worst thing he and his men have to deal with, but once they make planet-fall, they realize this isn't the case. Chaos runs rampant across the Imperial Forge World, pitting the Ultramarines against the heretical Chaos Marines and their armies of Renegade Militia, Tainted Psykers, and Bloodletter Daemons. All in a day's work for Titus.
You'll find screenshots of a few Chaos units below, along with several bits of concept art. Warhammer 40k: Space Marine will be arriving August 2011, for Xbox 360, PC, and PS3.