Call of Duty: Black Ops third map pack Annihilation has been unleashed on PC and Playstation 3. It will add four new multiplayer maps based on the singleplayer campaign. The four multiplayer maps are Hangar 18, Hazard, Drive-In, and Silo.
It also includes a brand new zombie map based with asian origins called Shangri-La which is arguably the most difficult zombie map to date. So if you plan to buy this DLC, do read our Black Ops Shangri La Strategy Guide.