Here's a set of Call of Duty: Black Ops screenshots and a trailer for the next DLC titled 'Escalation'. A collection of four maps plus a new zombie 'experience'.

"Hotel"... set 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.

Plus a unique zombies experience... called "Call of the Dead"...