According to the Facebook status
and the Call of Duty website
, the next map pack for Call of Duty: Black Ops, Escalation, will be released first on Xbox Live on May 3, 2011. This comes rather quickly behind the recent release of the PC version of the map pack one, First Strike (http://www.callofduty.com/intel/453).
Escalation contains 5 maps, with 1 adding onto Zombie mode for singleplayer/multiplayer. The 5 new maps are Zoo, Hotel, Convoy, Stockpile and Call of the Deed for Zombies.
Here is a little summary from the website
"In Multiplayer, battle it out in "Hotel", on the roof of a Cuban luxury hotel and casino against the vivid backdrop of old Havana; "Convoy" delivers intense, close-quarters combat at the scene of an ambushed US military convoy; "Zoo" takes you on a wild ride in an abandoned Soviet Russian Zoo, with danger at every turn; "Stockpile" pits players in a remote Russian farm town housing secret WMD facilities.
For Zombies fans, "Escalation" features a unique Zombies experience. We can't wait to take the wraps off of our new Zombies map, Call of the Dead, a very special creation for all Zombies fans."
Additionally, to celebrate the upcoming release, there will be a Black Ops Double XP weekend beginning Friday, May 6th. promoted forum post