Just got this from Elite:
Totally new to the franchise, Face Off distills all the fun and intensity of multiplayer into a new breed of 1 vs. 1 and 2 vs. 2 close-quarters combat. Four new Face Off maps – Aground, Erosion, Getaway and Lookout – will be available to Xbox Live Elite Premium members May 15th. Aground and Erosion will be available for all MW3 Xbox Live members May 16th.
Gonna check them out tonite since I don't get home till 1am and usually can start downloading around 2:30 am.