Well, it's hard to wish for an even longer version of SR, but it would be a shame if they didn't do something with that expensive (and supposedly impressive) "journey to Krypton" footage, now that Singer won't be using it in a sequel.
New blu-ray boxed set of an extended Superman Returns along with all the extended versions of the Chris Reeve movies and the "Richard Donner" cut of Superman II - only $500.
Seriously, I
would like to see an extended SR; but preferably as a stand-alone standard-format DVD.