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Gordon-Levitt’s role is to produce, and he may also star and even direct, according to Deadline, which also revealed that uber-writer Goyer’s treatment was what sold the project to Warner Bros., where the film is planned.
Gordon-Levitt appeared in The Dark Knight Rises, has a role in the upcoming Sin City sequel, is up for Ant-Man (see "Paul Rudd & Joseph Gordon-Levitt Up for 'Ant-Man'"), and will voice the starring role of Jiro in the English version of Miyazaki’s The Wind Rises.