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According to IGN, the basis for the script is already complete, following reports that David Goyer and Jonathan Nolan started work on the franchise's third instalment last month.
A source at Warner Bros apparently claimed that the film will centre around The Riddler as the main villain, with Arkham Asylum providing one of the story's main backdrops.
Several other classic foes are also allegedly in line for cameo appearances, including The Penguin and Mr Freeze.
The insider added that Barbara Gordon could face a more prominent role in the new film and that Dick Grayson may make an appearance, although it is unlikely to be as Robin.
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