The PC version of Fable 3 was originally supposed to launch alongside the 360 version - but was subsequently delayed. We were given a time frame of soon, that is, soon relative to the 360 release - but we're pretty sure the statute of limitations on that one have passed. Especially consider the 360 version is getting its first bit of DLC next week.
Fret not, according to the official Lionhead Twitter account, Fable 3 PC Edition is still in the works.
Fable 3 PC Version is still in development here at Lionhead so PC GAMERS don't panic. We'll announce details when we're ready to do so.
As long as when they are ready isn't soon, we shouldn't have to wait too long.