we went just last week and i really didn't notice anything to massively different. The drop sequence is different, a few more drops. My wife says that the drops were noticeably faster, but i really didn't notice. There are a few more though. Also on some of the drops that go all the way down, they flash images and stuff in front of you. There are more pseudo-drops (like 1/2 drops).
Its one of my favourite rides and my wife's VERY favourite and we were very happy with the changes...very subtle though they may be.
