I agree with Harris; Mr. Routh looks pretty good. I don't like the changes to the costume, but c'est la vie.
Regarding the Superman physique, a few years ago there was a fan-made Batman / Superman 'movie' trailer, and I believe Mike O'Hearn (or was it Brad Bartram?) was Superman. One can argue that O'Hearn didn't look that great in the costume, but he has a pretty good physique imo.
I remember a long time ago when I saw a picture of Christopher Reeve as Superman, and didn't think he had the physique for it. But when I watched the first movie, I forgot all that. He was totally believable as Superman. Superman is more then a bodybuilder body. Hopefully, Mr. Singer & Co. can make a great movie.