Black Ops 2's first DLC, Revolution, was released on 29th of January for Xbox 360 and a month later for PS3 / PC. Revolution is priced at 1200 MS Points / $15.
The DLC includes four all-new multiplayer maps and a new Zombie game mode + map. There is also a new bonus multiplayer weapon called the Peacekeeper, which is a powerful SMG.
The following 10 new achievements / trophies are also included in the DLC: