Jonathan Nolan is “now doing the hard work” of writing the script based on the story by his sibling and Goyer. “My brother is writing a script for me and we’ll wait to see how it turns out.... He’s struggling to put it together into the epic story that you want it to be.”
He continued on about the appeal of doing the third film. “I’m very excited about the end of the film, the conclusion, and what we’ve done with the characters,” Nolan said.“My brother has come up with some pretty exciting stuff. Unlike the comics, these things don’t go on forever in film and viewing it as a story with an end is useful. Viewing it as an ending, that sets you very much on the right track about the appropriate conclusion and the essence of what tale we’re telling. And it harkens back to that priority of trying to find the reality in these fantastic stories. That’s what we do.”
To be honest I'll be glad when Mr. Nolan and company end this Batman trilogy. Not because I don't like the series (if anything I'm in the tank for it) but because the most disappointing part of Joel Schumacher taking over the reins from Tim Burton was the destruction of the continuity of the Michael Keaton series. Nothing was ever really concluded. Having an ending in mind it only makes sense in Nolan's Batman universe. A vigilante can only fight crime for so long; he won't last forever.