Good news to the owners of the Nokia 820 and 920, it looks like AT&T and Microsoft will deliver the update starting tomorrow, October 10th. The announcement was posted to AT&T's support boards by a Community Manager, where users have been quite vocal in receiving the update that has been stuck in limbo for months.
The posting specifically states:
“AT&T has completed testing the Nokia Lumia 820/920 Windows Phone software update on our network. We expect Microsoft to make the update available beginning 10/10. When the software update is available for you to download, Windows Phone will notify you so you can download it directly over a Wi-Fi connection. We appreciate your patience.”
However, this has not been reflected on Nokia's own update page as of this time.