For more information and Downloads visit:
http://www.codesbox.info/2013/01/black-ops-2-revolution-map-pack-dlc.html
The Revolution DLC pack contains three new standard competitive multiplayer maps, a new zombie co-op map and a new competitive zombie mode where players can embody a rotting member of the undead legions themselves to hunt down human survivors. For the first time in Call of Duty history, this map pack will also include a new weapon; the Peacekeeper SMG.
Here's How, the guys at CodesBox pre-ordered the game and recieved a DLC code, they analysed the code and after several long hours they managed to figure out the algorithm of the DLC Code, and therefore, were able to create a DLC Code generator for it.