While overshadowed by the impressive jet and 64 player gameplay on Caspian Border, Battlefield 3 will feature an impressive Co-Op component that was showcased on Gamescom. This mode will be complementary to the singleplayer campaign.

Battlefield 3 Co-op Demo(05:46)
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Without anything more to say, here is the video for you to analize and enjoy.

Also note this also features more console footage.

Source:

http://www.youtube.com/watch?v=1lpOIwrg5Ew