I agree, do not fncking touch the John Williams score. That also means don't mish mash it with some lame, inferior, run-of-the-mill bullshit music, like they did in Superman Returns. And on the subject of Superman Returns, I went back and watched it a few days ago, just to see if I could possibly agree with the people calling for Routh's return. No fnking way - beyond the lame script, the acting, especially that of Routh, was amateur (I know they had little script to work with, but still). The only performance I liked was James Marsden's, who proved he would have been more apt at playing The Man of Steel (except, of course, for his height) - but he definately displayed bigger acting chops than the woeful, Routh, who spent the entire film with a wide eyed, perplexed expression on his face, and seemed to find it difficult delivering any line of dialogue convincingly (when he actually had a line to deliver, that is, which wasn't often - I assume Bryan Singer had to cut much of it out due to his poor acting performance).
As to Smallville and the mutilation of Superman's canon, it can be completely forgotten just like the 1990's Lois and Clark series.
Tom Welling can go back to doing underwear commercials or whatever it was he was doing before Smallville - the guy couldn't act his way out of a wet paper bag in a school play (and yes I know he's pretty, and if I was a girl, I'd... well let's just leave it there).
Looking at Dawn of the Dead, 300, and Watchmen, Snyder's definately the right man for the job. I haven't seen Sucker Punch, and didn't care much for The Guardians of the Owls of Gahoole, but I'm willing to forgive those trespasses, seeing as his three successes were all of such high quality within their respective genres.
The success with The Man of Steel, as with all movies, will rest with the script, and the acting, and so far it looks to be on track with proper, established actors being chosen for all the roles thus far. And Zack Snyder seems to be a director who polarizes opinions, so I guess he's doing something right (at least people aren't apathetic about him).
This is gonna be good.