EA finally gave Back to Karkand a release date, which is really just days away. PS3 Pre-ordered customers with the Limited Edition will finally get their moneys worth when the content hits on Dec 6 with Xbox 360 and PC following a week later.
I ran my battlefield 3 last friday to update my PS3 since I was aware of the 1.2 patch promised by DICE(thanks for the nerf in that damn light attachment btw). When updating I noticed the patch is 758MB. For a game patch? nah, that's Back to Karkand being placed into your system for preparation. When you claim your free expansion pack, most likely you'll be downloading an unlock code that's only a few KB's then bam you have Back to Karkand.
Back to Karkand will feature four Battlefield 2 maps remastered for the Frostbite 2 engine. Also included will be new guns, vehicles and a new game mode called Conquest Assault Mode. If you don't have a Limited Edition of Battlefield 3(honestly haven't seen a store selling a normal copy), you'll have to cough up $14.99 for the expansion.