The game is called X-Men Destiny and it sounds an awful lot like a Western styled RPG. It places you in the role of a newly recruited mutant and will feature Branching storylines. It could easily be an action game, but the introduction of a new mutant and the addition of choice in the story gives it atleast an element of RPG’s. The game is being developed by Silicon Knight of Too Human infamy and Eternal Darkness fame. You can check out the website and a small teaser trailer at http://www.herohq.com/xmendestiny#
Hopefully the fact that you are a new mutant means that you get to pick your power and create the character you play as. This is exactly the kind of game I have been waiting for from the X-Men universe. Now if someone can just make a game like this using the Buffy Universe I would be so down.