AT&T starts to push out Windows 10 Mobile Anniversary Update
The changes that come with the update include new and improved Quick Settings that are customizable, the inclusion of a new universal Skype app, an updated Microsoft Edge browser, and more. For a complete changelist, check out this story on the update.
The new version, numbered 14393.67, is being sent out OTA. This means that the update is going out on a staggered basis. If you don't receive it today, you might get it tomorrow, or the day after that, or the day after that. You get the point. The update will eventually reach your phone. And when it does arrive, make sure that you are connected to a Wi-Fi network and have your batteries fully charged before you start the updating process.