And what would Nolan do with Superman? Nolan has admitted in the past that he's not a comic book reader, and I have to wonder how familiar he is with the character, first of all. Secondly, are we craving another deadly serious Superman film after Bryan Singer's Superman Returns? Nolan is a skilled director, but his creative interests (namely, complex mysteries) seem at odds with the material. I think fans have been waiting for a more fun approach to Superman on film -- something with more comic book science-fiction and large-scale action. We're waiting on Darkseid and Brianiac and Mongul and Doomsday, not another Lois Lane/Superman love story set against a Lex Luthor money-making real estate scheme. Maybe, just maybe, they're meeting with Nolan to get his thoughts on revitalizing Superman by having him appear in the third Batman film?
Warner Brothers is moving forward on the project while they still have the chance. The rights to Superman revert entirely to the estates of Superman creators Jerry Seigel and Joe Shuster in 2013, and a new deal would have to be negotiated at that point (which I'm sure will happen anyway -- I can't see Warners letting Superman go). If they're trying to put something together for Summer 2012, they're going to be moving quickly, so expect more news on this soon.