Well Warner Bros always has a huge tentpole release every year, which has their biggest film in July. 2008: The Dark Knight, 2009: Harry Potter and the Half-Blood Prince, 2010: Inception, 2011: The Green Lantern, 2012: The Dark Knight Returns 
I don't see how 2012 is not possible. Mid-2010, Inception will be done, and then he will obviously take a break and then start filming the next Batman in 2011. 2013 is stretching it.
I don't see how 2012 is not possible. Mid-2010, Inception will be done, and then he will obviously take a break and then start filming the next Batman in 2011. 2013 is stretching it.