My prediction:
-Rumors will start circulating in a couple of weeks that American Carriers will start to push the OTA by "mid-September", Sprint first, followed closely by ATT/T-Mobile then Verizon
-Mid September will come and go, and there will be a huge forum thread full of "I got the UPDATE NOTIFICATION BUT I CANT GET IT TO REAPPEAR AGAIN!!" and "Guys, mid september could be anywhere from the 10th to the 22nd." There will be a post on Android Police with a screen shot of the supposed update notification, but nobody in the real world has seen or gotten it.
-October comes. HTC releases a PR statement (when pushed) that basically says blame the carriers.
-Two weeks later, Sprint, closely followed by ATT/TMo push it out, citing testing issues.
-Verizon gets it in June 2014.
Let's see how right I am
All conjecture based purely on past experience (aka BS) of course.