Additionally, there will be three new multiplayer maps (Sanctuary, Foundation and Oasis) plus two new Special Ops Missions. Of particular interest is the Iron Clad Spec-Ops mission where you may use an actual tank now. One player drives the tank, while the other player is on foot clearing a path for the tank driver.
All this content will be released for free to Elite Premium members on May 15, and available for sale on May 22 for 1200 Microsoft Points. Check out the trailer to get a glimpse at all the new maps too. Note that all this new content is arriving first for Xbox 360 players, with PlayStation 3 and PC players set to get all this way later than they really should.