http://pc.ign.com/articles/451/451199p1.html
"Right now the team is still working out the system requirements for the game. Todd [Hollenshead] was good enough to offer an idea of where he thinks the overall recommended requirements will lie. He imagines that
the game will run well on a 1GHz machine with 256MB of RAM and a GeForce 2 or equivalent card. "
Then again, that article is from a year ago, so *shrug*.