Mine just started.... I'm on Verizon (unrooted)
In Status, under Software Update, I'm showing
(Yes, really, that many repetitions of 10 and 605)
It also has the date of 10/01/2013 and a time of 9:12AM. So, roughly 26 hours ago (I got my phone on Day 1 of release, early in the morning, if anyone wants to try and correlate data for timing).
It still shows Android 4.2.2 and HTC Sense 5.0 however under standard software information.... so maybe Verizon just did something for their own software?