XDA Recognized Developer designgears shared the leak in our forums in Heimdall-flashable form. As has been seen on recent Samsung firmwares for other devices, this brings SELinux and KNOX to the device. Then for those who would prefer to only flash the update or the bootloader/modem, XDA Recognized Developer loserskater repacked the update, separating the pieces. He shared a pre-rooted ROM with KNOX disabled as well.
If you have an Galaxy S III I747 (AT&T, Rogers, Bell, Telus variants), head over to the threads below to get in on the action: