Didn't see anyone post this yet. Found this from an mmorpg.com post
http://www.mmorpg.com/discussion2.cfm/post/6279943/General-Warhammer-40k-Carnage-Announced.html#6279943
Warhammer 40,000: Carnage takes gamers straight into a world of chaotic action, as an iconic and powerful Space Marine, ripping through the Ork horde with brutal menace. Players equip themselves with a lethal arsenal of Boltguns, Chainswords, Grenades, Thunder Hammers, and more.
A twisted sense of gratification comes from unleashing Carnage on hordes of menacing Orks and other warring factions, on a planet mysteriously engulfed in Rage. The game is a fast-moving action Side-Scroller, where the right combination of weapons and Wargear and upgrades, make the difference between life and death. Players can also team up to complete challenging Fireteam missions.
The Space Marines must uncover the truth of what’s happened to the once prosperous planet, Mithra, level by level, before the rage storm drives the entire population to insanity and violent death!
http://playcarnage.com/
More marines. More orks as the villains.

Maybe a Khorne faction will show up later on considering the storyline.