If anyone knows more about it, they sure aren't sayin'. After searching the net for days, I've found 3 posts from people who had a problem, and beyond mentioning the wi-fi connection manager, nothing else about the update. Called HTC support ( you'd think they might know) ....nothing. Completely clueless about what it does. Couldn't even say if this would result in a reset and wiping user data. "Some updates will do that. Sometimes."---Yeah-- they actually said that, like it's some kind of random event that just happens.
So, having pushed the button, you are one of the few who knows anything more-- Do tell!
Unless you've already been contacted by the HTC Secret Service and made to sign the Official Android Secrets Act.