CNET has just confirmed that the Galaxy S3 will be receiving an update to Android 4.1 Jelly Bean as soon as October. The author of the post heard directly from a Samsung rep that the Android 4.1 (Jelly Bean) operating system will be "available on the Galaxy S3 from October.
There are unfortunately no firm dates as to when exactly the update will be rolling out, only that it will be coming near the end of next month. Samsung has, in the past, been quite bad at rolling out these updates for earlier models like the Galaxy S2, so it could be a while before all of the carrier-specific varients of the phone finally receive their official Google Now screens and re-sizeable widgets. Indeed, the Samsung rep said that "Details regarding the availability across network channels will be announced in due course."
It's been about two and a half months since the update was first announced, so we're glad that the Galaxy S3 is finally jumping on board the Jelly Bean train. We'll let you know when we know about which carriers will be receiving the official update first.