Battlefield 3 "Aftermath" DLC is finally official. After getting leaked a few months ago, and being mentioned again last month, the add-on has now been described in more detail by EA. There will be four new maps that take place in "a post-earthquake Tehran," along with new vehicles, a new game mode, and new assignments, achievements and dog tags to earn.
This promo page also hints at new weapons for Battlefield 3: Aftermath. There's no indication of what the new game mode is just yet, or when the content will drop. Currently, the release date is listed as "TBA" for both premium and standard BF3 players, but given that EA's shared this information with us, the DLC probably isn't too far off.