Verizon, Sprint, and US Cellular variants of the Galaxy S4 are being joined by the AT&T variant of Samsung's flagship today in the list of S4s that have been updated to Android 4.3. The update's now available over-the-air, at a gigantic size of 719MB, and as expected, brings features such as Galaxy Gear support, KNOX functionality, new TouchWiz features, improved camera firmware, and more, along with all the features of Android 4.3 (which aren't exactly that many from a user-facing point of view).
As is always the case, the rollout will be gradual, so it might be a day or two before your turn arrives. Be sure to do a manual check through the Settings » About phone » Software updates menu on your S4, or give it a try through Kies (once the update becomes available through Kies, it will also show up on our firmware section, from where you'll be able to download it and manually update).
