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Warner Bros has confirmed that the release date of Batman 3 (no other title included - just Batman 3) on July 20, 2012. We are not sure about the rebooted Superman release date yet but IESB claimed that Christmas 2012 is likely speculated.
From this point on, we know that Christopher Nolan is working on both films, directing Batman 3 and producing Superman. Some wild fire even grow larger when some speculated that he will indeed serves as the director of Justice League movie. We can just hope for further announcement from the studio soon.