New Map � Hindsight
New Map � Sunder
New Map � Wide-Awake
New Map � Infiltration
New Air Vehicles (for both Western Coalition and Red Star)
New Weapon � Anti-Air Rocket Launcher

Here's trailers of Hindsight and Sunder new maps:

Hindsight DLC Trailer - http://www.youtube.com/watch?v=p03sMbHd0S4&fmt=18

Sunder DLC Trailer - http://www.youtube.com/watch?v=OuKqEf_1rU0&fmt=18