Talk about milking the cash cow. Warner Brothers President Jeff Robinov has been speaking recently about the future of their DC Comic Book adaptations, which includes Batman, Superman and Justice League. Concerning the Batman franchise he said;

We have the third Batman, but then we’ll have to reinvent Batman. Chris Nolan and [producing partner and wife] Emma Thomas will be producing it, so it will be a conversation with them about what the next phase is.
I assume they really want to reboot Batman in order to make the character more accessible so they can easily incorporate him into a world where other superheroes exist so that they can go on to make the Justice League movie. Nolan has always said his Batman wouldn’t work in a world with other superheroes, and once he’s done it seems Warners will be making the move to set up the Justice League movie. Seems they’re jumping on The Avengers band wagon. Although Nolan’s involvement does confuse me in that case. And their target for that movie is 2013, which seems highly unlikely considering Batman will only be done by next year and Superman will only be rebooted at the end of next year.
I’m very disappointed to see that the franchise may be starting a fresh so soon after Nolan’s trilogy is complete, and involving him with other DC characters could easily ruin the integrity of the character that Nolan has worked so hard to establish.
The Dark Knight Rises is set for a summer 2012 release, with the Green Lantern out this summer and the new Superman set for December 2012.