If you go out to see V for Vendetta, make sure you're there early, because some (I'd imagine it's really most, but my evidence is anecdotal, so I can't say for sure) theaters are pairing it with previews of X-Men: The Last Stand and Superman Returns. I haven't been following the making of Superman Returns so I don't know if this has been an issue all along, but the preview was awfully heavy on the Christ imagery. Does this mean Jor-El is God? (Well, it does feature Marlon Brando speaking from beyond the grave.)
Saw "V for Vendetta" on Sun. Despite being a fan of Alan Moore, I'd never read the comic nor had my wife. We both enjoyed the movie (hey, the plot holes were waaaay narrower than "League of Barely-Recognizable-From-The-Original-Stories-Gentlemen"). Yes, there were previews of the next X-Men & Superman movies. And, yes, you're right it does seem like there's now a backstory wherein Marlon Brando (who at one time in the industry was, after all, considered the next best thing to god) has planned the whole idea of sending his son as a savior to us puny earthlings.
I've seen the Superman promo before, but thought it was still an excellent trailer - strong on atmosphere and sparse on details. The Brando voice-over isn't new, is it? I thought I remembered that from Superman I...
I haven't seen the X-Men trailer.
I'm 90% certain the Brando voiceover was from the original Superman (and 100% it was made during the filming, less certain of its inclusion).
I don't think the idea that Jor-El sent Superman to Earth is new. The Kryptonians were a race of highly advanced super-man, meaning "humans" who achieved in fact all the things we hope humanity can become. Not really surprising that in finding a place to send Kal, he picked a place where Kal could one day help to lead the natives to the state of the Kryptonians.
The Brando monologue is taken directly from the original Superman movie.