Skullgirls doesn’t have a release date yet, but it does have a new trailer. It also has PlayStation 3-exclusive trophies. Reverge Labs announced on the PlayStation Blog today, that the PS3 version of the game will have four exclusive trophies.
As far as game modes go, Skullgirls has: Story mode, Arcade mode, Tutorials, Practice Room, Ranked/Unranked Online. It also has support for custom soundtracks.