Lionsource put online this video filmed at the Game Convention in Leipzig showcasing a lot of Will Powers in Fable. Their server is almost impossible to connect to so I've mirrored the file here, all credits go to them of course.
Update : Added 2 other videos from Lionsource presenting 2 quests from the game. There are some spoilers in there, you've been warned !
Update 2 : Lionsource very nicely asked me to remove the videos, so go check them on their site.