Skullgirls is now available on PSN will be available on XBL tomorrow. I recommend everyone here to try out the demo at least. The development studio was very involved with the fans during its production and I feel that it will be a very good game. It has a small roster of only 8, but that's to be expected from an indie studio. Game features custom assists, infinite and unblockable detection, and team ratios. Here's a vid.

Skullgirls: Story Mode Trailer - YouTube