Galaxy S3 Jelly Bean official Kies firmware update: I9300XXDLIB
Its here. Update has FINALLY started rolling out for the lucky people in Poland via Kies. In the coming few days the rest of us will be getting it.
For those who cant wait you can always head over to XDA Developers(My FAVOURITE forum) to download custom ROM’s based on 4.1
For a complete list of whats new head over to Android official site.