Over at DICE's Battlefield blog, they have officially announced when the new "Onslaught" mode for Battlefield: Bad Company 2 will come out, as well as pricing for the new mode. The new Onslaught mode will be available on both the Xbox 360 and PlayStation 3 June 22 for 800 MS points or $9.99.
Onslaught will bring four player co-op to the Battlefield series, offering four different maps for players to take on waves of AI enemies as well as complete squad based tasks to get players working very closely with one another to take on their objectives.
With all that Battlefield: Bad Company 2 has to offer for single player and multiplayer, this seems to be an excellent way to blend the best of both worlds into a mode that offers the gameplay of a single player campaign with the teamwork of a multiplayer squad match.
Source: Battlefield Blog