“Involved” is such a vague word.
I'm just a tad skeptical of the level of his involvement with the project. From what I've seen, the gritty reality that he was able to convey in his two Batman installments doesn't mesh well with the heavily fantasy-centered world of Superman. He was forced to take certain liberties with Batman canon just to make Gotham City believable.
He has been labeled the “godfather” of the project, who will function as a producer and an overseer type figure, but for some reason that just seems suspect to me. I would not be at all surprised if this was just a move by Warner Bros. to be able to drop his name in the trailer: “From producer Christopher Nolan, critically acclaimed director of Batman Begins and The Dark Knight...” After all, who wouldn't want their film associated with that kind of genius. I just want to know exactly what his responsibilities will be, and “making sure it doesn't suck” probably won't do the trick for me.
Don't misunderstand me. If he is involved in a legitimate way, I would be okay with that. I'm sure he would have valid creative input to contribute, but input is where it should stop. He knows how to make a superior dark thriller, but is that what we really want the Superman reboot to be? Batman is a black, brooding, vengeful type of character who necessitated that same style of film. Superman has almost the opposite vibe; he is a brighter character all about hope and all those other feel-goods. Granted that there are some possibly dark aspects to the story that could be perverted into being gritty, i.e. him being the last son of a dead planet Krypton, but brooding just isn't what Superman is about.
And he's an alien! Aliens have no place in the Nolanverse as it currently exists. That's why I don't see the crossover ever happening with Nolan's Batman and Superman that many so desperately hope for. The fantastical world of The Man of Steel is just too...let's say fictional, to mesh with the shadowy realism of Christopher Nolan's vision of Gotham City.
Sorry for being such a downer, but that's just how it all smells to me.