Oh my god, thank you so much for telling me that lol. I was already convinced that the game would be epic, but that whole co-op thing makes me want to "Elbow-Drop a tank from 20 stories, while my bro does whatever the hell he wants."
But I've seen a video on it on xbox live, check it out if you've got it.
There's conflicting reports on the co-op. It looks like it's gonna be XBOX Live only. :{
I'll be buying it for PC then, so I can play it all night long, whenever I want.