Variety just released an article saying Hans Zimmer will be scoring Zack Snyder's Man of Steel next year. Zimmer was rumored to be doing the score last year and debunked those rumors himself.
It's an interesting choice to say the least. While Zimmer's previous work seemed to fit perfectly into the world of Nolan's Batman, Superman seems to be at the opposite end of the musical spectrum. One thing to keep in mind is that this isn't the exact Superman we are familiar with either. Not much is known in the story of the new Clark Kent, but it seems clear that this is going to be something fresh for the character.
At this point I'm very interested and hope Zimmer is able to be even more creative and give us something huge and heroic that doesn't try to outdo John Williams' classic score, but fits well with this new identity for Superman.