[ROM][GT-I9300][4.1.1] CyanogenMod 10 -PREVIEW- – xda-developers.
TeamHacksung and XDA Recognized Developer XpLoDWilD has put up a very early preview build of CyanogenMod 10 Jelly Bean.
In the first 24 hours the thread already had 40,000 views. Once it is ready (maybe in a month?) CyanogenMod 10 is unquestionably going to be THE ROM to have on your Galaxy S III.