We saw The Polar Express on an IMAX screen in 3-D. Since computers stored the entire movie, converting the film to 3-D could be an automated process. I predicted to my unbelieving children that when they grow up they will not be able to distinguish between computer generated film and those filmed live. Perhaps all movies then will be stored in some specific format like papers in PDF today that could be easily converted and optimized to whatever display device a person has.
Unless you have small children, I would recommend The Incredibles over The Polar Express. Technology does not win over substance. But I have seen the future and it is cool.