Why didn't they include more of Heath Ledger in the Dark Knight Special Edition DVD?

I was very excited when it came to DVD. I bought it the day it came out!! But the special features included behind-the-scenes footage about the Bat suit, the Bat pod, and the music, some background to events in the movie plus a variety of trailers, poster art, and more but with all the hype about Heath Ledger's performance and the character he created, etc...THERE WAS NOTHING on the joker/heath ledger........why? are they going to re-release the dvd with a 2nd Special Edition covering Heath Ledger and the joker any time soon?Why didn't they include more of Heath Ledger in the Dark Knight Special Edition DVD?
i heard, im not sure, but i heard that they want to re-release a more extensive Heath Ledger edition of the film during the 09 holiday season.



i heard that shortly after they released it in DVD so I don't know if it is still on.Why didn't they include more of Heath Ledger in the Dark Knight Special Edition DVD?
not to sound rude but because he died... i think he died before they were actually done... he just disappeared from the movie like outta nowhere at the endWhy didn't they include more of Heath Ledger in the Dark Knight Special Edition DVD?
hell no. ledger's performance was already covered on all the tabloid garbage sites. his ability to consume himself with the persona of The Joker should stay in the movie and not some crap fested "Behind the Music" montage.