Nolan was initially unsure of returning for the sequel, but eventually decided upon creating a new interpretation of the Joker, based on the villain's original appearances in comic book lore. The Dark Knight was filmed primarily in Chicago, as had been done for Batman Begins, as well as several other locations in and outside the United States. The director also used an IMAX camera to film four major action sequences, including the Joker's first appearance. The Batsuit was redesigned, with a cowl allowing Bale to move his head, and a recreation of the Batcycle known as the Batpod will be introduced.
The studio undertook a viral marketing campaign for The Dark Knight in which websites were created so Batman fan collaboration would reveal items such as new screenshots from the film. The film will also be marketed by selling related toys and an animated direct-to-DVD anthology titled Batman: Gotham Knight that is set between Batman Begins and The Dark Knight. The Dark Knight has a tentative release date of July 18, 2008 in the United States.