Battlefield: Bad Company 2 Vietnam was just announced at EA's press conference. The first expansion pack to the hit FPS series will be released this winter. No further details were airdropped, but we'll be sure to fight our way to getting more details soon.
Update: EA has revealed a few more details about Vietnam, which will be a multiplayer-only expansion, featuring four new maps. Additionally, the add-on will include "enhanced" persistence, as well as new weapons, vehicles, unlocks, awards and Achievements/Trophies. Pricing will be announced at a later date. Peep the trailer after the break.