today i was informed that EA has announced 3 new expansion packs: close quarters, armored kill and end game

Close quarters:

In Battlefield 3: Close Quarters, players are dropped into a frantic, infantry-only theatre of war. Frostbite 2 high definition destruction makes the environment come alive as everything from furniture to plaster gets shot to pieces. Players will feel the intensity of the world exploding around them as rubble and broken pieces pile up on the floor, while tight level design and vertical gameplay create a highly competitive environment

Armored kill:

Following the tight infantry gameplay of Battlefield 3: Close Quarters, DICE will release Battlefield 3: Armored Kill that ups the ante for vehicular mayhem as only Battlefield can do.

Featuring new driveable tanks, ATVs, mobile artillery and more, Battlefield 3: Armored Kill also delivers huge battlefields for an all-out vehicle assault, including the biggest map in Battlefield history.

and then the details for "end game" are tightly guarded

Source