Samsung just released it's Android 4.1 Jelly Bean kernel source code for the LTE Samsung Galaxy S III (GT-I9305). Don't confuse this device with the dual-core snapdragon S4 US Variant as this is the European LTE variant. GT-I9305 has the same Quad-Core Exynos 4412 CPU and the same ARM's Mali-400MP GPU as the international Samsung Galaxy S III (GT-I9300). The only differences are that the European LTE variant uses 2GB RAM instead of 1GB and has LTE Radios.
This means that 3rd party Android developers, like the CyanogenMod team, can use European LTE Galaxy S III's (GT-I9305) Android 4.1 Jelly Bean kernel source code to fix major bugs like the Memory Leak, HW Composer and Mali GPU related issues they were having with the International Samsung Galaxy S III (GT-I9300) as these both devices are very much identical. This source code can vastly improve and improve their Custom ROMs.
You can download the source code for the LTE Samsung Galaxy S III (GT-I9305) from Samsung's Opensource Release Center.