Accompanying an incredibly short teaser trailer for the Chaos Rising expansion to Relic Entertainment's Warhammer 40,000: Dawn of War II is something slightly more useful: actual in-game screenshots. Oh joy!
Further digging on that THQ site lead me to find two things out. First, the game has glorious box art which will undoubtedly cause you to cry out "blood for the blood god" into the night, so don't even consider viewing Chaos Rising's cover when in a public place.
The second thing I figured out was that while the mighty Chaos Space Marines are in fact playable in multiplayer, that isn't the case for the rest of the game. It pains me to say this, but for single-player, you're going to be sticking with the Blood Ravens whether your like it or not.