Director Christopher Nolan's The Dark Knight Rises is currently in its final stretch of production in Los Angeles, working towards a release date of July 20, 2012. Boom operator and sound recordist Frederick Roche recently revealed some interesting information about the production through his Twitter account, indicating that the ending will be completely done with visual effects. Take a look at what he had to say below.
"#thedarkknightrises technical info: The ending sequence is soo secret that only 5 (Includ Nolan) know it and will be done completely in vfx."
"#thedarkknightrises technical info: They are shooting on #IMAX Yes But shooting with the film in portrait! so essentially 105mm."
This information should be taken with a grain of salt, though, since Frederick Roche isn't currently listed as a production member on The Dark Knight Rises. It is possible that he is working on the movie, but hasn't been added to the IMDB page as of yet.