According to the folks at CNET, Samsung directly informed them that the international version of the Samsung Galaxy S III will be receiving the Android 4.1/Jelly Bean update sometime starting in October. This certainly jives with the many rumors we have been hearing that it would be coming soon. Of course, this doesn't vie us any detail on when the update will hit the U.S. versions of the phone, but perhaps it won't be too far from the international version. Of course, we will keep you informed as more details emerge.
Source: S3Forums via CNET