The expansion pack Back to Karkand is out now on PlayStation 3, Xbox 360, and PC. This new trailer features gameplay footage from the Battlefield map Sharqi Peninsula, now remade and improved using the Frostbite 2 engine.
You can get Battlefield 3: Back to Karkand for free if you own a copy of Battlefield 3: Limited Edition, or you can buy it for $14.99 / 1200 Microsoft Points.