Christopher Nolan said he wasn't going to have Robin in any Batman film he directs. Also Christian Bale said he wouldn't do a Batman film with a side kick of any description. Also I heard Nolan is casting Joseph Gordon-Levitt as a 2nd villain

Come to think of it given Joseph Gordon-Levitt slight resemblance to Heath Ledger I wouldn't be surprised if he plays the Joker who's locked up in Arkham after the events of The Dark Knight

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