In addition to a big, head-trippy single-player campaign, the upcoming Far Cry 3 will feature a fleshed-out 4-player co-op campaign. It's more than your standard "kill the enemy waves" setup; FC3's co-op has a story, complete with four different playable characters. There's the hardassed chick, the goofy older russian dude, the wiseass cockney (or some such accent?) criminal, and the big tough action dude.
Here, a Ubisoft representative walks us through the ins and outs of a couple of co-op missions. Cool.