Best guess is that it includes Batman's entrance in TDK and the little bit that played during the ensuing fight.
One of the highlights of the film, if you ask me.
Ya, I love how that one bit of music from Begins entrances him as he uses the hydraulic weapon to take out the rifle, just coolness.
Hopefully, with Prologue right before Buyer Beware, if it is the Scarecrow scene music, it flows seemless from the first track to the second like Why So Serious and I'm Not A Hero on the first disc, as it does in the movie.