A new patched version of Battlefield 3: Back to Karkand will be released tomorrow on the PlayStation Network.
The update that fixes the “weapon animation bug” in the DLC won’t be a simple 12MB patch, and instead requires you to redownload the entire DLC. DICE’s Tommy Rydling explained:
Starting tomorrow (March 13th), you can re-download a new, patched version of Battlefield 3™: Back to Karkand on PS3. This will fix the weapon animation bug that some of you have experienced. This download is free of charge if you have already bought Back to Karkand. Note that changes made on our back end will make this re-download mandatory in the near future. If you buy Back to Karkand for the first time after tomorrow, no additional action is necessary.
As Rydling notes, you’ll have the option to not update at first, but eventually it will become mandatory.