The Galaxy S4 Android 4.4, KitKat update release date will be set for today for AT&T customers.
AT&T posted up details yesterday regarding the software's roll out. It is not available at the moment, but should arrive in either afternoon or evening time.
Android 4.4 KitKat has already arrived for U.S. Cellular customers.
The company began offering the latest Android software OTA (over-the-air) last week, and several customers have confirmed they received the update successfully.
It is also available for the International variant of the Galaxy S4 in Russia and India. Users can check for it manually if they haven't received a notification in the Settings menu.
Both Sprint and U.S. Cellular already began rolling out the software for the Galaxy Note 3.
This new software brings minor UI changes included the use of KitKat style white status bar icons instead of the mult-colour icons found on past Samsung devices. The smartphone also received a performance boost and an increase in benchmark scores, according to a Sam Mobile report.
The lock-screen now features a camera shortcut that takes users directly to the point-and-shooter. Album art also now shows up on the entire screen when music is played.
The update is being rolled out in phases so different countries will receive it at, according to Samsung's release schedule. The KitKat update will roll out to most of Samsung's high-end devices in the near future.
The company released a list of those that will upgrade via press release earlier this week that included the Galaxy Note 3, Galaxy S4, Galaxy S4 Active, Galaxy S4 mini, Galaxy S4 Zoom, Galaxy S3, Galaxy Mega, Galaxy Light, Galaxy Note 8.0, Galaxy Tab 3, Galaxy Note 10.1 and Galaxy Note 10.1 2014 edition.