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The upcoming movie will bring an end to the trilogy of Christian Bale-starring films helmed by the Inception director.
"I must say that I'm glad - I'm very, very glad - to be embarking on the last chapter of our Batman saga without any sense of obligation or duty to the studio," Nolan told Entertainment Weekly.
"They did very well with Inception. So I'm able to go into finishing our story in a very enthusiastic way."
He added: "I feel very glad that I'm doing another Batman film. I think it would have been daunting to sit down and write an original script after Inception.
"I love working within the realm and rules of our Batman world. It's kind of nice to have someplace to go that I'm super-excited about."
The Warner Bros and DC Entertainment movie is due for release in summer 2012.
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