rockin said:

The colour timing is vastly different from the trailers...

We've been over this before in a discussion on ESB: the trailers come out way before the film is finished, so yeah, the final cut of the movie is probably going to have a different color timing than the trailers ;)

They also usually have a different soundtrack, different sound effects, sometimes different dialogue, different takes, and often scenes that aren't even in the finished movie.

captainsolo said:

The IMAX scenes ideally would be at their original 1.44:1 ratio and then seamlessly switch back to 2.35:1 for the Panavision 35mm majority.

But then all the 2.35:1 scenes would have to be pillarboxed and wouldn't fit the entire width of the TV, and I get the feeling that most people would be unhappy with that. It would be okay if we still had 4:3 ratio HDTVs...but unfortunately, those are getting more and more rare. And most of them probably don't play very nice with BluRay players.