unfortunately, he has already stated that he will not... and that will always be something that makes Fable and Fable 2 come short for me of being a really great game...
he said that he doesn't want people to spend too much time weighing decisions rather than going with their gut or feeling like they missed something or that they made the 'wrong' choice, so he's not having any branching storylines, it will be just like the first game in that no matter what you do, nothing really changes as far as the main story... and that's just disappointing