I think it was kept pretty close to the vest until recently. Have you looked at the Tron: Evolution voice talent thingy that ufgator1977 put up? (posted in Bruce's fan community over the weekend if you need to go back and look for it.) It pretty much gives it away. You even get a glimpse of video game Bruce. Video game Bruce(/Alan) = not so great, really - but Bruce being interviewed and doing the voiceover thing? Adorable. He's so cute the way he gets excited about his work.