According to the Head of Xbox, Phil Spencer, Fable fans have something to be excited about! Unfortunately, it's not a new installment in the Fable franchise. Instead, Microsoft is looking to bring Fable Anniversary to the Xbox One via backward compatibility.
This should come, it's being worked on now.
— Phil Spencer (@XboxP3) September 19, 2017
There's no word on when the game will release, but at least we know it's coming.
Fable Anniversary originally released in 2014 for the Xbox 360 as a remastered version of Fable: The Lost Chapters. The game features overhauled graphics, a new save system and brought Achievements to the game.