Yahoo Movies has this poster hidden amongst their Tron: Legacy photo gallery. It’s the theatrical poster from Walt Disney, and is a nice homage to the 1982 original Tron poster.
I would never use the word “final” when it comes to Legacy images, as these things pop up every ten minutes, but it’s nice to finally have the official version that will be all over the walls of your local theater soon.
UPDATE: I added the original Tron poster at the bottom for reference, which I should have done all along. Thank you, talkbacks!
And the original from 1982…