Through a bit of clever misdirection, it seems that Batman and the Joker have returned to Bedfordshire, England. Signs bearing the letters 'RFK' lead to the Cardington airship sheds, where, according to Bedford Today, The Dark Knight is being filmed.
It is believed that the initials RFK stand for Rory's First Kiss, the fake named being used by the makers of The Dark Knight to misdirect over-eager fans. Rory is the name of director Christopher Nolan's son, and 'RFK' signs were seen in Chicago while The Dark Knight was being filmed there this summer.
The Gotham City set from Batman Begins was constructed in Cardington, and left standing after that film. It is believed that shooting is once more taking place on that set.
The Dark Knight stars Christian Bale as Bruce Wayne/Batman and Heath Ledger as The Joker. Also featured in the cast are Maggie Gylenhal, Michael Caine, Morgan Freeman and Gary Oldman. The Christopher Nolan-directed superhero epic opens in theatres July 18.