Here is a great tip courtesy of Macgasm:
Normally iOS 6 asks you to take your panoramic photos from left-to-right. Starting on the left of your subject, and then moving to the right. To change that from left-to-right to right-to-left, all you have to do is tap the arrow icon. Boom, panoramic mode flipped.
This is great, obviously, if whatever you want to capture is to your left.