Comics sites reported director Christopher Nolan's announcement today that he will be involved with the new revised Superman movie franchise, and that the Superman movies will exist in a separate universe from the Batman ones (to quote the LA Times: "[Nolan emphasized] the idea that Batman exists in a world where he is the only superhero and a similar approach to the Man of Steel would assure the integrity needed for the film.").
To which the Collected Editions blog says: why?
Seems to me (being not a popular and successful director) Superman and Batman can easily exist in the same movie universe* without it needing to be confirmed nor denied. Easily from a story perspective one can posit that Batman's such an urban vigilante that he might be below the notice of Superman (yes, even Superman), or that if one event takes place in Gotham and another in Metropolis, the twain need not intersect.
The reason for fan concern, of course, is that separating the universe negates the possibility (of sorts) of a Justice League movie (Justice League: Crisis on Two Earths being a good start, but not quite the "real thing").
And I can't help but think, once again, Marvel is farther-sighted than DC in this. Fans like team-ups -- it's why the Avengers and the Justice League has worked for years -- so even if a team-up movie isn't necessarily in the works, teasing it like Marvel has done across Iron Man and Hulk seems a lot better idea than dismissing it out of the gate.
Only -- does this characterize a difference in the moviegoers? Lots of non-comics fans saw Iron Man, but so did a lot of comics fans, and they loved the little hints of other superheroes. But I'd venture (totally unsubstantiated) that even more comics and non-comics fans saw Dark Knight, and hardcore Dark Knight fans -- "Batman doesn't sleep, doesn't smile, and he's not friends with that silly Superman" -- might not want any Superman in their dark Batman movie. That is, maybe Marvel-on-film lends itself to a shared universe better than DC-on-film does.
Me? I actually liked Superman Returns.
* Don't Superman and the current Spider-Man exist in the same movie universe? "You're not Superman" and all that?