Probably worth mentioning that some Tron Legacy footage was screened for George. Jeff Bridges' younger CGI head was probably in there.
Spoiler alert if you haven't seen the movie yet.
http://collider.com/joseph-kosinski-interview-tron-legacy-tron-3-reshoots-easter-eggs/66520/
We ought to start a betting pool on potential new changes. My money's on Gungan rebels being put in. ;)