Okay, Pete, I will look at Fable 3 with hopes that it's better in many ways than Fable 2.
I enjoyed Fable 2 progressively less as I played through it. I earned too much money (before the end of the game) and it effectively broke the game. The jobs which earned you more money than quest rewards broke the game. I can...kinda forgive the ending, I suppose.
I did find the game enjoyable - even though it cooked my Xbox because the DVD drive span too fast.
But the main thing wrong with Fable 2 - The laggy as hell menu screens (even after a patch, if I recall). If they are no more (and the weird room-menu thing I've read about is not horrible broken either) then they may yet take my money for Fable 3.
BUT With Fallout: New Vegas, Assassin's Creed: Brotherhood, Medal of Honor and Halo: Reach all out in Autumn then Fable 3 is going to have to be pretty spectacular to make me buy it anywhere near it's release.