First attempt to make it less town-sided. Tracker is gone, and replaced with a watcher. He can see who was yakked, but can't prove the cop as easily. (He can, however, find the other power roles.) Janitor gives the mafia more night one faking potential by knowing the role of the killed. The basics are still there, though. Amnesiac has to pick between the dead townie and the Yakuza without knowing who's who. Basic mechanics still the same.
And yes, it's a no-reveal setup without a mortician. Get over it.