XXUGMJ9 is just leaked a few days ago for Samsung Galaxy S3 GT-I9300. this is a beta or test version with new Android 4.3 changes like the new launcher UI found in the Galaxy Note 3 as well as Galaxy S4, but without Knox, according to samfirmware




image source: samfirmware


firmware details:
pda: XXUGMJ9
csc: VFGGMJ5
modem: BUUGMJ3
build date: 26 October 2013


download link:
link 1 (by samfirmware)