There's an article at AICN that mentions the score in a paragraph, but it's nothing more than the writer's hesitations about the score, which I am sure many of us share.
"One of the more highly anticipated films of the year is, of course, SUPERMAN RETURNS, which will be scored by Singer faithful John Ottman, who will be editing the picture as well. The thought of Ottman using John Williams’ original 1978 Superman theme has me terrified. A legendary theme in the hands of a composer who did not compose it will have a hard time shaking off that cheesy sequel smell. I’m almost wishing that if John Williams isn’t scoring it, then leave his themes alone."