Go to this site and let it play for a bit and you will see the first image of Heath Ledger as the Joker:
This is an actual Warner Brothers site for their marketing campaign for the next Batman movie.
Looks more realistic than Jack Nicholson's cartoony face in the first Batman. Looks like Ronald McDonald as a psycopath.
You can also check out this site:
but not much on there.
I can't wait for The Dark Knight to come out!! Looking forward to this one.