HTC One (M8) for AT&T to receive Android 4.4.4, Eye Experience, HD Voice and more with today's update
AT&T has posted information about the update, with today's date listed. The OTA update will bring HD Voice, Android 4.4.4, a security and a Bluetooth enhancement, and will add a Copy and Paste feature for the camera. Other changes include the addition of AMBS Cloud Messaging integration, a Usage Manager app for the phone, improved battery life and updates to AT&T Ready2Go and Visual Voicemail. The file is also expected to contain the Eye Experience feature for the camera.
Since the update is being sent out in waves, you might not receive it for a few days. If you're impatient, you can try to manually receive the update by clicking on the software update option on the settings menu. Once you have received notification of the update, make sure you are connected to a Wi-Fi network and you should have your battery charged to at least 50%. AT&T also recommends that you back up your media files to a microSD card or a PC.
source: AT&T via AndroidCentral