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.
Battlefield: Bad Company 2 Vietnam will add four new multiplayer maps, as well as 15 new weapons and six vehicles, all congruous with the new 1960s locale and Bad Company 2's universal experience point system. Among other era-specific items, you'll gain access to the M79 grenade launcher, the Navy SEAL XM22 machine gun, the American Huey helicopter and the Russian T54 tank.
The DLC, which requires the Bad Company 2 game disc, will retain the game's universal experience points and add ten new Achievements and Trophies.