It doesn't look like anyone has posted to this in a while but for those of you out there here is some new info. The Joker will be played by Heath Ledger and Harley Quinn is to be played by Sarah Michelle Gellar.
Just saw the film and I am awe struck. The multi-levels of experiences. As an action film, good. As a philosphical tome to current moral questions of good versus evil and how far does the good go to protect itself; excellent. Showing true anarchy brought on by a criminal who could also be labeled a terrorist. How far do we go to protect our culture, our mores? And what of the casualties along the way? Do we kill to prevent, do we torture to prevent & protect? Where do we draw the line from being unprotected sheep to becoming facist ourselves. A good film that is timely, well acted, and should be discussed by all who see an erosion of our liberties in the name of fear and security.