User blog comment:PFC Arkalis/Battleblog 7: Battlefield 3 introduces themed co-op campaign/@comment-5524047-20110820015953

Interesting. I'd quite like one or two missions with up to four players working together simultaneously. Also if it ties in with the main story it might show minor conflicts or events that can't be in the campaign and can be shown from the viewpoints of more then two or three characters.