Didnt see this one here on the forum, so here it is: http://www.youtube.com/watch?v=V6VdMpyqKmk
Seems like this multiplayer arena game's gonna come out later this year.
Character name is Mireia Valentin or Lilith.
From the official site:
Character Unique Action
Grabs the opponent, siphons their life force, and uses it to transform into Lilith. During this time, mash the Character Unique Action button to steal additional life. Once transformed, your speed and power increase.