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Your long wait is over, official Jelly Bean stock firmware is now available for your Galaxy S3 GT-i9300. (Please DO NOT FLASH on U.S./Canadian GS3s!!!)
This first official Jelly Bean stock firmware is for Poland GT-i9300 but it is compatible with any GT-i9300 models and does come with all the languages (as shown in installation video below).
We’ve seen much of the official Jelly Bean features with the leaked JB ROMs but pretty much you get all of the Jelly Bean butter-smooth UI, Google Now/Google Cards, and some more enhancements Sammy added in various different parts.
It looks pretty solid and definitely you should upgrade. If you are on stock rooted ROM, you can probably install this ROM without doing a data wipe/factory reset. However, if you are coming from a custom ROM, my advice is to do a data wipe/factory reset in CWM Recovery before installing.