Battlefield: Bad Company 2 Vietnam hid its "winter 2010" launch date so cleverly in the brush that we're not sure if it can even find it now. It turns out that Russian intelligence (from 32bita) may be able to give us some intel on the game. Sure, it's not a release date, but some spy has posted all the weapons and vehicles that can be found in the multiplayer expansion.
Fair warning: it's spoilery. As in: these are the guns you'll get. Granted, there are many guns like them, but these are the ones that will be yours.
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.