Wizard Universe has the transcript of The Dark Knight Panel that featured Christian Bale, Gary Oldman, Aaron Eckhart, and director Christopher Nolan.
This is a question for both Mr. Bale and the writers: Will you be playing up more of the “Dark Knight Detective”/criminologist angle of Batman this time? [Audience applauds]
CHRISTOPHER NOLAN: The short answer is “Yes.” The long answer is that “Batman Begins” was an origin story and the important thing was to move the story forward. In this movie, the detective stuff will help move the story along.
I can not wait for this movie to come out.