The long and short of it: Onslaught allow you to game with 3 other people against waves of AI (bots)... sounds cool. I suspect the battlefield intensity will go up and teamwork will be key. I would also guess that each squad member will have a function based on the kit they choose, and that there will be only one kit per person (1 assault, recon, engineer and medic).

Onslaught mode will be available on Xbox Live and on the PlayStation Network. What? no PC?

Battlefield: Bad Company 2 brings Onslaught as as the game reaches 5 million

Battlefield: Bad Company 2 has officially exceeded 5 million units sold world wide. Thanks to everyone who has supported Battlefield and bought a copy. In other good news we can officially announce Onslaught mode coming to Xbox 360 and PlayStation 3.

Onslaught is bringing co-op gameplay to Battlefield for the first time on console. The new game mode puts you and up to three friends against the enemy on 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.


DESCRIPTION:
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

Official Website:
http://www.battlefieldbadcompany2.com/agegate

Read More:
http://blogs.battlefield.ea.com/batt...5-million.aspx