One thing we know about the next Superman movie is that it won't be Superman Returns. They're going with a new fresh story with a new director. Now I really don't care who's playing superman or what changes you're going to make just get us a Superman on the big screen. Fans are more than ready for it.
Then I started to think if They're going to change Superman around, are they going to change everything including the Theme? If so, I think this is going to be a mistake. You can't change the Superman theme. That's just as iconic as Superman himself. Changing The theme would be like changing the theme to Star Wars (which John Williams also composed) or Changing the theme to Halloween. You can't have superman without the Heroic Theme music. You can change the Superman, Lex Luthor, hell you might can get away with changing to suit but please don't change the Theme. That sets the tone for the whole movie.