Yesterday, the Skullgirls Facebook page announced that the "Slightly Different Edition" patch was finally available on the Xbox 360 version of the game. The PlayStation 3 version was patched in November of last year, but issues with Microsoft's patching process caused a huge delay.
There are way too many changes to even begin listing here, so check out the official patch notes and marvel in just how different the game is after the patch. It addresses a lot of the problems I had with the game upon launch, including the addition of more Training Mode options like dummy record. New colors are also being added, and can be previewed on the PlayStation Blog.