Onslaught mode - BF:BC2 gets some co-op action on.

It sounds awesome.

Screenshot is semi-related. There might even be some lame jokes about "hanging around" or "winging it" to be had there, but I won't touch it.

The bit you should not miss is below - click on the links above to get a slightly more wordy PR-treated set of info.

"Battlefield: Bad Company 2 Onslaught mode can be played with up to four players across four multiplayer maps – Valparaiso, Atacama Desert, Isla Inocentes, and Nelson Bay – redesigned with new lighting, time of day, added vehicles and other effects. Each map has a dedicated gameplay focus, requiring different levels of teamwork in order to complete the objectives against an onslaught of enemy AI. Vehicle warfare comes to the forefront in Atacama Desert while Nelson Bay focuses squarely on infantry assault. Players can compete in squads and check individual progress via the dedicated Onslaught leaderboards."