The second multiplayer map pack for Call of Duty: Black Ops 2 may be just a couple weeks away. A leaked retail ad for a DLC pack called Uprising says that it will be out on April 16th.
The leaked ad (via AGB) reveals that Uprising introduces five new maps to the game. Vertigo, Encore, Magma and Studio appear to be standard competitive maps. The fifth, Mob of the Dead, is for zombie mode.
Black Ops 2' first DLC, Revolution, debuted earlier this year. That DLC provided five maps, along with a new zombie mode and new new weapon. There's no indication right now that Uprising will add anything to the game beyond the maps specified in the ad.
The April 16th release date only applies to the Xbox 360. Thanks to a long-standing agreement between Microsoft and Activision, Call of Duty DLC is a timed exclusive on the 360. PS3 and PC players generally have to wait an extra month
Black Ops 2 map packs are $15 apiece. The $49.99 Season Pass provides access to all four packs as they're released.