The Samsung Galaxy S III for AT&T (SGH-i747) is now receiving a software update which is around 69MB in size, and bring the KOT49H.I747UCUFNJ1 software version. AT&T has been very vague on the changelog, simply stating that the update brings "Android OS Enhancements"
The update is being rolled out OTA, and you should receive a notification when it is available for your device. You can also manually check for the update by heading to Settings > More > About Device > Software Update and Check for Updates.
The Galaxy S III is an Android smartphone which features a 4.8 inch touch display, up to 64GB of internal storage which can be expanded through microSD, an 8MP rear camera capable of 1080p video capture, a secondary 1.9 megapixel front camera for video calls and a dual-core Qualcomm Snapdragon processor with 2GB of RAM.
source - AT&T