Warner  Bros. president of production Jeff Robinov had hoped a third film would  be released in 2011 or 2012.Nolan wanted the story for the third  installment to keep him emotionally invested. "On a more superficial  level, I have to ask the question," he reasoned, "how many good third  movies in a franchise can people name?" He returned out of finding a  necessary way to continue the story, but feared midway through filming  he would find a sequel redundant.By December 2008, Nolan completed a  rough story outline, before he committed himself to Inception. Later in December, Alan F. Horn confirmed  that while discussions with Nolan about a third film were ongoing, no  casting had been done, and Horn denied all such rumors.
Before  Nolan confirmed his involvement, Gary Oldman had said he was confident  Nolan would return.Nolan explained that as long as he is  directing, Robin will not be appearing in the franchise  because Christian Bale is still portraying a "young Batman," which meant  "Robin's not for a few films." In addition, Nolan considers  the Penguin difficult to portray on film, explaining, "There are certain  characters that are easier to mesh with the more real take on Batman  we're doing. The Penguin would be tricky."
Oldman,  while taking questions from an audience at the 2009 San Diego Comic  Con, was asked about a third film, to which he replied, "We start  shooting next year. You didn't hear that from me." He subsequently  clarified his comment, saying, "... well, I'm sure they want to do  another one... it might [be] 2 or 3 years."However, in 2009, Michael  Caine had told MTV News that  the film was not being worked on and he did not know any details. On  February 9, 2010, it was announced that Nolan has "cracked" the story of  a sequel to The Dark Knight and has committed to return to that  project. In February 2010, work on the screenplay was commencing  with David S. Goyer and Jonathan Nolan. ( Wiki )
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