I got a pair of these boots about 2 and a half years ago and I was very impressed with all the technology that went into them but after speaking with the AS guy at OExWest two weeks ago apparently there's quite a bit new news to share:
New version is about a pound lighter (in size 10) than the old version
More flexible
Better foot protection
"dynamic heel compression protector" in sole
free natural movements with controlled hyper-flexion
New buckle system that is lighter, stronger and more compact
Soft side inserts for better grip of the bike between your legs
And still $599 although you can typically find them on sale from time to time at various retailers.
I got this color but wish I'd had white for rally racing (black is hotter)