How to update AT&T Samsung Galaxy SIII to Android 4 1 Jelly Bean
http://booredatwork.com/2012/12/04/how-to-update-att-samsung-galaxy-siii-to-android-4-1-jelly-bean/
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You can now update your AT&T branded Samsung Galaxy SIII to Android 4.1 through Samsung's very own Kies Air which you can find the download link here for the software
http://www.samsung.com/us/kies/
The update seems to be at 318MB, brings in, Google Now, a performance increase and an overall bump in frame rate and "Project Butter".