From the Lionhead forum, FAQ on Fable Legends:
Is Lionhead making Fable 4? Will Lionhead do so in the future?
Fable Legends is the only Fable core game in development, and we have no plans to make a sequel to Fable III. However, in Fable Legends you’ll find many of the great features of Fable I, II, and III have been carried forward in our game’s design. That means the world of Albion, exciting stories, quests, humour, light-hearted action, and memorable characters.
Disappointing. And obviously no PC release for Fable Legends. :/
Is Lionhead making Fable 4? Will Lionhead do so in the future?
Fable Legends is the only Fable core game in development, and we have no plans to make a sequel to Fable III. However, in Fable Legends you’ll find many of the great features of Fable I, II, and III have been carried forward in our game’s design. That means the world of Albion, exciting stories, quests, humour, light-hearted action, and memorable characters.
Disappointing. And obviously no PC release for Fable Legends. :/