Nice interview on Newsarama. http://www.newsarama.com/movies/Superman/SuperWriters.html Basically this is a sequel to Superman I & II. At the end of Superman II, Sups tells the President, "Sorry to disappoint you, I won't let you down again", because he was not there when Zod invaded Earth. So then he promptly goes off into space for a few years? This doesn't really make sense.
(edited by kentish on 16.5.06 0948) Baby, you've got a stew goin'!
I really can't see Tony letting Vito leave, he is a captain. Vito's guy Gene wasn't even allowed to leave. Maybe he'll mull it over, due to his new outlook on life, but his session with Melfi makes it seem that new outlook is on the way out already.