You've got the yellow and blue spandex outfits in the comics, so why not let the movie do it's own thing with the costumes? Frankly, the costumes they have are a little unbelievable as it is (I mean, think about having to do that much movement in skin-tight leather).
About the Iceman thing at the end, how could he turn the water into ice if he couldn't get out of the jet, anyway? Also, I think the image of the phoenix flying under the water was a VERY big clue about where the next film will go.
Couldn't Rogue fly using the powers from Magneto if he could fly? Or is that a temporary thing? BTW, I noticed in the trailers that Rogue was walking through walls. Does she have a lesbian love scene with Shadowcat or something?