G4TV: You're going to have to forgive us, but with Warhammer 40,000: Space Marine still early in development, there isn't much to see yet. Not only did THQ not let us play it at E3 this year, but they didn't even have a playable version that we could watch someone else play. But they did have a trailer handy, and we were allowed to ask questions after we watched it, so here's what we can tell for now.
The game is a third-person action-RPG that, if the trailer is to be believed (and we don't see why it isn't) will be more along the lines of God Of War than Diablo. It is currently being developed by Relic Entertainment (who've made such RTS games as 2004's Warhammer 40,000: Dawn Of War, and 2006's Company Of Heroes) for both the Xbox 360 and PlayStation 3.