According to Samsung Mobile UK,
“In order to facilitate an effective upgrade on the Google platform, various hardware performances such as the memory (RAM, ROM, etc.), multi-tasking capabilities, and display must meet certain technical expectations. The Galaxy S3 and S3 mini 3G versions come equipped with 1GB RAM, which does not allow them to effectively support the platform upgrade. As a result of the Galaxy S3 and S3 mini 3G versions’ hardware limitation, they cannot effectively support the platform upgrade while continuing to provide the best consumer experience. Samsung has decided not to roll-out the KitKat upgrade to Galaxy S3 and S3 mini 3G versions, and the KitKat upgrade will be available to the Galaxy S3 LTE version as the device’s 2GB RAM is enough to support the platform upgrade.”
** 2GB Variant of Galaxy S3 Will get the Kit Kat Update.
GSMArena: Galaxy S III I9300 and S III mini won't be getting KitKat update - GSMArena.com news
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WHAT THE FLYING F*CK SAMSUNG? You seriously need to go S*ck a D*ck.