The new trailer for this actually came out a couple of days ago:
http://www.apple.com/trailers/wb/supermanreturns/hd/
I think it's pretty terrible myself. After Michael Rosenbaum played Lex Luthor as a real human being, this Gene Hackmanesque parody is tough to take.
Rosenbaum IS Luthor.
Spacey's Luthor I imagine is like his Dr. Evil in the movie in the movie Austin Powers:Goldmember. Ugh.