Batman Returns in The Dark Knight

Via SciFi Ranter Girl. SciFi Wire reports on the next Batman film.

Christopher Nolan directing, a script by Jonathan Nolan, a story by Christopher Nolan and David Goyer. Christian Bale back as Batman, Heath Ledger as the Joker.

Nice. I wonder if the story has any relationship to Frank Miller's Dark Knight Returns? What's the chance of Superman appearing in it? (Probably none, but it would be cool).