According to the source this is one of the final build or in last stage of testing and nothing will be excluded or included in the official OTA from Samsung and those impatient readers who couldn’t resist the temptation can download the firmware and follow our howto guide to update to leaked kitkat build.
Changes in firmware according to sammobile were
The changes are very similar to the Galaxy S4′s KitKat update. There are some minor UI changes, status bar icons have been changed from green to all new KitKat white. Performance has significantly been increased with the KitKat update, even unlocking the device is much faster than before, and benchmark scores are just off the charts. There are some improvements to the lockscreen, as well. Samsung has implemented a camera shortcut on the lockscreen and while playing music the album art goes full screen in lockscreen.