Samsung has officially started rolling out the much-anticipated Android 4.4.2 update to all its Galaxy S4 and S4 LTE-Advanced (LTE-A) variants currently located in Korea. In addition to the hefty bump up from Jelly Bean to KitKat, however, this particular upgrade brings a newer version of the TouchWiz user interface, as well as a multitude of bug fixes, speed optimizations and stability improvements.