Samsung have today rolled out a maintenance update for the generic Samsung Galaxy S IIIs sold in Australia — from Dick Smith and the like. The update keeps the device on Android 4.0.4, but does bring stability, security and performance increases.
The update is 93MB in size, so if you are going to download it, make sure you do so over a WiFi network; ensure your battery is well charged, also.
There has been no word on the release date for Jelly Bean on the generic Galaxy S III, however, Samsung pushes most updates out at the same time — so once the carriers begin the roll out, the generic devices will also get it.