Hit the link for 20 minutes of us playing Army of Two: The 40th Day, the demo of which released for both 360 and PS3 yesterday.
There's a lot shown off in there: co-op controls, a morality system, weapons upgrades, a GPS thing, some buildings blowing up and two large men bumping chests together. It's got it all.
Note: this is only playable with a live partner. No bots. Which is why it's taken so long to get this live. Watch to the end and see Johnny's connection crap out. It's hilarious.
The game's out on January 15.