Android 4.1 Jelly Bean makes it way to the Samsung Galaxy S III AT&T variant model SGH-i747 that brings many new features and improvements like detailed notifications, camera improvements, face unlock, Google Now support and many more.
Android 4.1 Jelly Bean Update for Samsung Galaxy S III is not available as an OTA, so you can grab it through Samsung’s Kies desktop application.
You can find more details about Android 4.1 Jelly Bean for At&t Samsung Galaxy S III at source.