At the end of “The Book of Eli” panel, Gary Oldman was asked when fans can expect a third Batman movie.
Surprisingly he answered saying, “We’re starting filming on the next Batman next year. So it won’t be out for another two years at least, I think. But you didn’t hear it from me!”
Taking it with a grain of salt, this means that we can expect the third Batman movie to hit in 2012. Not much else is known for now.