Call of Duty: Black Ops map pack Escalation has been released on Xbox Live Marketplace.
The downloadable file is 986.42MB.
The price is 1200 Microsoft Points.
Xbox.com doesn't list the Escalation pack for download yet, but we've checked the Marketplace and the maps are definitely live.
Inside the Escalation pack are Zoo (a deserted Zoo), Hotel (one of Cuba's most luxurious), Convoy (an ambushed military convoy), Stockpile (an isolated Russian Village) and Call of the Dead - a undocumented zombie level.
PC and PS3 releases will follow.