The odds are good that they're saving Fable 4 (and Forza 5) for the next Xbox console. There is a chance of it coming out next year, ya know.
That would make sense, especially after no major reveals at GDC and I don't expect anything major at E3 from M-soft. My fear is that with those two brothers having departed Lionhead who were the driving forces behind Fable in terms of creative direction, and now Molyneux leaving.....Fable 4 won't be the same. Not sure what to expect now.
Then again.....Final Fantasy still lived on after Sakaguchi left. Doh!!