Battlefield 3's "Back to Karkand" has been deployed on PC and Xbox 360. The maps for the expansion were buried in a recent PC update, so the mouse and keyboard crew should be good to go. Xbox 360 users have a 2.07 gigglebyte update ahead of them, so that's something to get going on ASAP. The PS3 version was updated last week.
"Back to Karkand" is free for those who picked up the "Limited Edition" version of BF3 at launch -- otherwise it's $15 (the standard for FPS map packs).
The mega Xbox 360 download doesn't just add Karkand maps, however, as there's also a ginormous list of changes made to single player, multiplayer and Battlefield 3's general balance. Check it out after the break.