Most likely didnt mention 4K-video as a feature in KitKat since Koreans already have 4K-video since 4.2.2. Its still just some few carriers that dont have 4K-video and they will get it when they get KitKat.
please see my ss link
I have recording UHD Video before updated to kitkat
i excepted that it won`t get a 4K vide (ye UHD :D) cuz it`s wasnot in update of G2 which`s camera sensor supports UHD and slow motion... and i think Flex camera also supports (trought it`s a DIS camera)
AnonD-248442, 27 Mar 20144k video recording . That mean " UHD video recording " ?If yes . My G flex can recording to UHD 3840x2160 Model F340S