A screenshot of the Sony Xperia Z Ultra Android 4.4.2 KitKat firmware was revealed a few days ago, which is likely to come from a leaked build. Well now the system dump from this firmware (14.3.A.0.681) has also leaked, courtesy of the EXR Group on XDA.
Interestingly a peak into its contents reveals that the firmware does contain a few goodies seen in the Xperia Z2 such as the Simple Home launcher, Movie Creator and Answering Machine. However, a number of significant features are left absent including 4K video, Timeshift video, Tap to wake, Smart call handling, Smart backlight control and Glove mode.
Obviously, this is from a leaked ROM, so this in no way the definitive word on what will or will not be included in the upcoming KitKat update. If we do see minimal features being ported from the Xperia Z2, then you can always rely on the developer community to port as much as they can to other devices. This is something we have already started to see plenty of in recent days, so expect it to accelerate once the Xperia Z2 launches.