Gearbox informs us that there is a new patch out for Borderlands 2 that sorts several mission glitches, problems with unlocks, and the issue of lost Badass ranks, among other things.
You'll find a full list of fixes here.
There's also a bit of information on the next piece of DLC, thanks to leaked trophy details on PS3. The DLC is called Sir Hammerlock's Big Game Hunt.