We didn't get a release date for Aftermath, the next set of four maps for Battlefield 3's multiplayer, but an official page does provide some detail as to what it includes. New vehicles and a new game mode are featured on four new maps set in Tehran after an earthquake. Destructible terrain would seem to be highlighted in this set. [Official site]
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For the 15487357th time, they are not MAP PACKS. They are EXPANSION PACKS.
Sorry, I'm just… agh. There is a huge difference between an expansion pack and a map pack. :H