Great analysis.
Here's question: have we figured out yet why Joker turns around TWICE at the end of the trailer?
In the long shot, he turns around slowly as Batman passes him, torquing his body along with the motion of the Batpod as it does a 180. (This is roughly from 1:48 to 1:50.)
Then, Joker turns around again - obviously, after the "Let's put a smile on that face" line. This time he does it in a jerky fashion, very unlike the first motion in the previous shot (which was long and slow as the bike went around.) This occurs about 1:53 to 1:55, etc.
If you're like me, your eyes were glued to the Joker the whole time during the trailer, which is why I found it strange. It's cut together in such a way to look like Batman passes by, and then Joker turns around in the next shot. But if you watch the Joker the whole time, Joker obviously turns around twice.
So what's going on? Are these two different shots spliced together? Probably. But then why are both perspectives the same? (In both instances, Wayne tower is behind Joker in the distance as he faces the other direction.) Obviously, both shots take place in the larger context of the chase scene, but I just can't figure out why he turns around twice, once in reaction to the bike, and again in reaction to...? And facing the same direction, nonetheless?