The website Kino has posted some details from an interview with the Dark Knight director Christopher Nolan and producer Charles Roven, sadly however, the website is entirely in German. Not to worry, Batman on Film have some interpreters (otherwise known as Google Translate) to work it all out for us non-bilinguals:

As we already know, Batman (Christian Bale) travels to Hong Kong. Producer Chuck Roven confirmed [the] Asian trip but would not reveal why Batman goes there. “Gangster hunting” was mentioned.

The new Batman suit will be equipped with “[white] lenses” (some sort of bat sonar equipment).

The prologue that will be shown in IMAX in December is the first five minutes of the film.

Here’s a translated quote from Chris Nolan: “[The Dark Knight] is not ‘The Joker Begins’. We did not want to tell how the Joker became what he is.

“In those five minutes [of the prologue], we show how the Joker goes from being a small-time crook to Gotham’s greatest villain. It’s like ‘The Rise of the Joker’.”

Meanwhile, composer Mel Wesson, working with James Newton Howard and Hans Zimmer on the Dark Knight score, mentioned the dark theme they were aiming to achieve (via BatMovieNews):

This is the one I’ve been waiting for. Another outing for Gotham’s Dark Knight, together with Hans Zimmer and James Newton Howard. I began working on ideas in mid September ‘07, it’s a long schedule but it’s good to have time to experiment and expand the ideas we had on Batman Begins into the darkness…. don’t forget ‘Not all jokes are funny’.