A prequel to free-running classic Mirror's Edge is in development. The game promises an "open-world adventure," but it's early in development and probably won't be released for a year or two. In the meantime, you can get your parkour fix by bounding around town—or you can save yourself from a lot of pain and injury by simply watching someone else do it. The folks at Ampisound have put together an epic POV video that, ahem, faithfully channels Mirror's Edge.
After watching that, I think I may need to fire up some Mirror's Edge tonight. The prequel can't come soon enough.