After that the existence of the new expansion Escalation of Call of Duty: Black Ops was leaked last week, Activision has now officially announced by the Major Nelson blog: the DLC arrive on Xbox 360 exclusive time on May 3 and will 5 new multiplayer maps, including one dedicated to the Zombie mode.

The four maps for the multiplayer competitive game are those already leaked the news earlier, namely:

• Hotel, set on the roof of a luxury hotel and casinos in Cuba
• Convoy, a map dedicated to fighting at close range on the scene of the attack at a U.S. military convoy
• Zoo, set in an abandoned Russian zoo
• Stockpile, a remote rural town in Russia that conceals equipment for the construction of weapons of mass destruction

We will update you when more information will be released on the package or when Activision Escalation will confirm the price, according to previous rumor, should be 1200 MSP.