Crysis 2 will soon leap, slide, shoot, and ground-stomp each other in four new DLC maps: "Park Avenue, Transit, Shipyard, and Compound." They're set to drop on May 17 as the "Retaliation" map pack.
The add-on is coming to Xbox 360, PlayStation 3, and PC, though its availability on PS3 is dependent on whether or not PSN is back up by next week. No price is given in the announcement, nor the trailer, so we'll try to find out for you.
Update: An EA rep confirmed with Joystiq a price of 800 MS Points/$9.99 for the DLC.