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This link states the kitkat Update for T2 Ultra to come in July 2014.
http://www.thinkdigit.com/Mobiles-PDAs/Sony-Xperia-Z-ZR-ZL-and-Tablet_20901.html
Trust Sony has taken into consideration all the complaints / bg fixes whjch have been raised.
It will take few days to roll the kitkat update through OTA. So you have to wait for it.
just install this file, u can update your software when the phone off http://sony-mobile-update-service.software.informer.com/download/
I tried to update with the Sony companion pc software and it disconnected Atleast 4 times. It is not even available OTA. I got a notification today, but it still says computer required.
Is this an authenticated method? I don't think so