Teach yourself: http://www.spacemarine.com/ If you like WH40K it's probably the best thing since sliced bread. I'm not a huge WH fan but it still looks very interesting. What I really want to see is how they handle multiplayer.
Hope you're talking about multiplayer because the co-op (from what I can remember) will be released as free DLC a month after the game because they want to do it right.