The good news is that when it comes to the update scheduled for today, HTC came through as promised and has started sending out the OTA update that brings both Android 4.2.2 and Sense 5 to the device. The latter includes BlinkFeed,which brings you your news and social media feeds. Also included is an updated Gallery app, Video Highlights, Music Channel and Miracast.
The update also will fix problems with the AT&T address book, and problems with NFC. The download will take 20 minutes to complete with another 10 minutes needed to install it, and you need to have your battery charged to at least 35% full. The software version you are installing is 2.15.502.1. You can try to pull it out of your phone manually by going to All apps > Settings > AT&T Software Updates > Check for updates > Ok.
As we stated the other day, the update will go out on a staggered basis which means not everyone will receive it at the same time. If you don't receive it today, perhaps it will come tomorrow.
source: HTC via AndroidCentral