This is the first teaser trailer for the last new Batman movie, The Dark Knight.
And it really deserves the name 'teaser': after watching -listening actually- the teaser, one is still in the dark ;-p
But anyway, the voices let feel the movie's atmosphere.
Judging from from this teaser and from the pictures you may see here
I can be but confident that The Dark Knight is gonna be as good as Batman Begins
if not better !