Actually, if you look at the scene in the White House at the end of X2, both Rogue and Iceman have there uniforms, which I would take to mean they were promoted. Also, in the deleted scenes on the DVD, they have a scene with Jubilee where it expands a little on her character (not much, but a little glimpse of her powers).
And Archangel/Angel was supposed to make it in to the movie, but the producers felt that it would be to many special effects-driven characters in one movie. So maybe next time.
Also, if you noticed, Hank McCoy made it in- he was being interviewed on a talk show in the background.