Nexus S has released in Australia by Vodafone service provider.Still now Nexus S is running with Android ICS now its available with Jelly Bean upgrade.Recently Vodafone Australia has rolled out the update to all the Nexus S device in Australia.The Jelly Bean version of Android 4.1.1 and additional there is no UI or other enhancements are not released. Today morning this update has rolled out and it has seems to be the over the Air update.Also customers from Australia are so crazy about the gadgets and now Nexii is getting their update on Jelly bean as well.Also in US and other international device Nexus S start receiving the Jelly bean update.
To do the update just go here Settings > About phone > Software updates in your settings screen