In something of a surprise, it appears Samsung has already been hard at work on preparing the Android 4.1 Jelly Bean update for the Galaxy S III, as evidence by this YouTube video posted by AndroidMX. The build is labeled as i9300XADLG4. It's definitely looking legit, and while the visual changes to the Galaxy S III in Jelly Bean seem minor, there's no doubt that many owners of the device are absolutely chomping at the bit for access to Google Now in its full, un-ported glory. First, the video (warning: it's long and highly repetitive):
Now, here are a few screencaps we managed to grab:
One thing you may notice is the revamped notification bar, which incorporates some of the new actions found in Jelly Bean like the instant sharing option for screenshots.

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Leaked Samsung Galaxy S III Jelly Bean Build Pops Up On Video, Shows Off Revamped Notification Bar was written by the awesome team at Android Police.