Peckerwood, the new short limbs store a bit less energy than the 64"-66" limbs, but they have just a slightly higher dynamic efficiency. Rastaman is right - the tradeoff for 8"-10" shorter bow is a few feet per second. As I have said before, most folks wouldn't notice but we want everyone to understand that fact since performance is our first, last, and middle name.
David, I talked with the shop today and they have several sets of shorter limbs in the finish stage right now. Hopefully yours won't be much farther out.