Got the new OXM, and they have a good article on the co-op mode. Love OXM, btw. Only gaming mag now that EGM is gone, that consistantly has info I havn't seen on the net.
ANYHOO
Apparently Co-op mode is not some tacked on mode like in WaW, and is so big it is actually it's own seperate game. 23 different missions using rearranged versions of the sp maps, to suit whatever game type it is.
Coop is called SpecOps, actually. Game types:
Assault: Sends you through a level to take down a target in a certain time frame, while avoiding civilians.
Stealth: Sneaking past everyone
Wave Defense: Horde/Firefight type mode
Elimination: Drops you in a level with a set number of respawning enemies, and you have to kill them all.
But there's more to it than that. There are lots of neat ideas that are thrown into these missions to spice things up and add to the experience. I'll put them in spoilers just in case some people don't want the surprise ruined, but two of the moments mentioned were:
One person laser tags things on the ground for another player who is in an AC-130 Gunship. Another section of co-op actually has you working against your partner in a snowmobile race.
Sounds so fucking good.