That's why they call it a teaser, my friend. I happened to check it out yesterday - it's only the second time I've seen it (I'd love to see it on DVD, along with all of Bryan Singer's blogs!) - and I found it pretty impressive. Granted, the clip of young Clark falling through the barn is a bit reminiscent of the clip from "Batman Begins" where young Bruce Wayne fell through the cave, but otherwise the trailer has pretty much all of the necessary elements to entice new fans and long-time Superman fans who fondly remember the Christopher Reeve films.After seeing it a few times, I've come to the conclusion that SUPERMAN RETURNS does not have a great trailer. Strip it of the Williams and Brando audio and what do you have? And I still don't understand why they had to alter the colors of Superman's costume...these days it seems everyone has a better idea, you know?
If it didn't have the John Williams Krypton theme and the Marlon Brando voiceover, it would be missing something unique that we remember all too well. However, I take it to be part of Singer's approach to the film to make it a sequel of sorts to STM and Donner's SII, to have those elements in place for SR. Besides, SR won't be the only time where the John Williams theme has been used in another Superman medium - remember the Ruby-Spears cartoons from 1988? Ron Jones incorporated the theme into his version of the main title theme, and it worked. As long as John Ottman remains true to the spirit of Williams' original music, I'll be happy with it.
As for the darker muted colors of Superman's costume, granted it leans toward the slightly darker colors the evil Superman wore in those moments of SIII, but again we have to remember that this is a new interpretation of the costume. Every generation of Superman has had its own interpretation while staying true to the familiar design. Having the S shield as the belt buckle is a tip of the hat to Yvonne Blake's original costume designs for Christopher Reeve's costume for STM - even then, she designed the costume to have the S shield as the belt buckle. And while the shorts are quite smaller than what we remember, we should be thankful that it's not a thong he's wearing!
Kal-El.org has a new image of Brandon Routh as Superman on the site, this one the latest in the "Got Milk?" series. Quite a funny tie-in!
Plus, if time has supposed to have elapsed between Superman's time on Earth and stuff has happened since he's been away, why are all the actors so young? 
a score I never liked that much on its CD, but I tell you, that is a totally new experience in 5.1 whoaaa! 