NYTimes.com:
Borrowing a marketing ploy from 20th Century Fox and “Avatar,” the Walt Disney Company said it would preview more than 20 minutes of its forthcoming “Tron: Legacy”free at Imax theaters around the world. Fox and Imax created this model by showing about 15 minutes of “Avatar” a few months before that movie’s release.The screenings will take place Thursday, 28 October. Tickets will be available on a first-come basis starting tomorrow. You can find more information at facebook.com/tron.