One Last Level

Although Infinity Ward is in complete turmoil they will be releasing a new map pack, the maps will be at the same asking price as the last DLC they will include 5 maps two of which are returning from the previous Infinity Ward installment, and three which are new by now it's obvious that Infinity Ward isn't too keen on fixing any glitches that still burden the game regardless the three new maps are called Carnival, Trailer Park and Fuel the maps from Call of Duty 4 that are returning are Vacant and Strike.
Although a PS3/PC release date hasn't been announced it's expected that it will be out in July for PC/PS3 owners Xbox 360 owners however will be getting the Map Pack on the 3rd of June.

Trailer Park will exist within the single player campaign, it's the residence of the owners of the Boneyard area, Robert Bowling described the map as 'Close Quarters Combat".

Carnival is basically what it sounds like it takes place in a abandoned amusement park, with roller coasters, a fun house and a World of Tomorrow, Bowling also described that Snipers will have fun picking people off from the roller coaster.

And finally we come to Fuel, which Bowling describes as "Sniper Heaven" it features numerous oil pumps and outposts, with warehouses that will house most of the combat.

You can view the screenshots at the url's posted below

Trailer Park
Fuel
Carnival
No Idea What This One is
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You can expect the review on the 5th (the 4th in some countries)