A supposed advertisement for an upcoming Call of Duty: Black Ops content pack was leaked last week, but is now official. Titled, Escalation, the content pack will be available on Xbox Live on May 3rd and includes a new zombies map:
"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."