Speaking to CNET UK, Samsung has confirmed the Galaxy S III sold abroad will be getting Android 4.1 (Jelly Bean) "as soon as" October. Which sounds wonderfully non-committal. Though if that October estimate holds true, it'd probably be a record for Samsung. Perhaps they've finally realized people care about OS updates.
We've already seen leaks of Jelly Bean firmware for the international S III, as well as the T-Mobile edition in the US, so this sounds about right to us. When the LTE version of the S III launches in the UK on the Everything Everywhere network, it will actually come with Android 4.1 pre-installed.