The new map pack will being coming out June 3rd exclusively to XBox Live. There are five maps in total.
Carnival, Trailer Park, Fuel, Strike, and Vacant. I can't wait to get my hands on them to try them out first hand. There will be a review as soon as they are out.
In other news, the newest addition to the Call of Duty franchise, "Call of Duty: Black Ops" has a release date of November 9th, 2010. It is a Treyarch production instead of Infinity Ward, so I'm guessing it will be more glitchy as well as more bloody. There are two trailers on XBox Live and Playstation Network respectively.