It has already been released by Sprint and Verizon, and now AT&T is finally bringing the Android 4.3 Jelly Bean update to customers with a Samsung Galaxy S4. In addition to support for Galaxy Gear, the 718MB release adds the new KNOX security features, as well as TouchWiz improvements and other new features.

The update comes with build number JSS15J.1337UCUEMJ9, Android Central reports, and you should be able to download it both over-the-air and via Samsung’s KIES applications for Mac and PC.

Samsung doesn’t tell us exactly what’s new in these updates, unfortunately, but here’s what the Android 4.3 update brought to the international Galaxy S4:

CHANGES AND IMPROVEMENTS IN ANDROID 4.3 UPDATE
– OpenGL 3.0 Support
– TRIM Support (Makes the device much faster)
– ANT+ Support
– Samsung KNOX Implementation (KNOX bootloader and dedicated application)
– Samsung Wallet comes pre-loaded
– Improved RAM management
– Improved Display colour reproduction (Display looks much sharper than before)
– Improved TouchWiz Launcher (Much less launcher redraws and less lag)
– New Samsung Keyboard
– New Samsung Browser (Full screen by default, new tab interface and more)
– New Reading Mode (Optimises display for reading, used by only a few specific applications)
– New Camera firmware
– Minor UI tweaks (Contacts app, Flashlight Widget, dialog boxes etc)

• ViaAndroid Central