As previously mentioned, the update brings Android 4.3 and Galaxy Gear support. It also brings support for Samsung KNOX security software. There are bound to be a number of minor tweaks, changes and improvements as well, though they haven’t been detailed in the changelog. The update itself weighs in at 537MB, so it would be a good idea to download it over a Wi-Fi connection. Just remember to have ample juice in the battery before proceeding with the installation, its best to plug in the device and let the update download and install itself. Its not unusual for carriers to send over-the-air update notifications in stages, so even if you don’t immediately see your device prompting that an update is available, be assured that its definitely going to drop very soon.