Chill guys! Lionhead is a HUGE company. From what I heard, Fable: The Journey is being made not by the Fable guys, but by the guys who worked on Project Milo. They are set to work on Kinect games, while half of the Fable team work on dlc for Fable 3. The remaining half of the Fable team are working on the initial stages of Fable 4.
So, in a way, you can call The Journey a spin-off. From what I've seen, though, this game better be priced at 15$ or be a 800 mspoints download or something. It doesn't seem like major game potential.