While no US carrier-branded variants of the Galaxy S4 have received an official update to Android 4.4/KitKat yet, Samsung has dropped the KitKat kernel source for the Sprint's model. While that by itself is really only of interest to developers, its implications will matter to a much larger audience. Generally, Samsung does not release kernel source for builds that aren't official. Historically, once source code is made available, official OTA updates follow in reasonably short order.
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