The first expansion pack for Battlefield 3 will hit in December, EA confirmed today.
The Back to Karkand expansion contains four "remastered" Battlefield 2 maps: Strike at Karkand, Wake Island, Gulf of Oman and Sharqi Peninsula. The expansion also contains five new dog tags, five new achievements/trophies, three new vehicles (DPV, BTR-90, F-35B STOVL jet fighter), 10 Battlefield weapons and a new persistence system where you can complete assignments to earn rewards.
Back to Karkand is available for free if you pre-ordered the Battlefield 3 Limited Edition. Pricing details were not announced.