News on "The Dark Knight" sequel

Betterthanfudge.com has some info on where Christopher Nolan's Joker character will draw his motivation:
"I would certainly point to The Killing Joke but I also would point very much to the first two appearances of the Joker in the comic. If you look at where the Joker comes from there’s a very clear direction that fits what we’re doing very well.

He also goes on to say:
"The title (The Dark Knight) has been chosen very specifically. It’s quite important to the film.""