Quick update for Sony Xperia Z1 or Xperia Z Ultra owners out there. TELUS, Rogers and Bell users are reporting that OS 4.4.2 KitKat has finally arrived on your device. Build number is 14.3.A.0.757 and can now be downloaded. Check your Xperia – Touch Applications >> Settings >> About Phone >> Software update.
(Thanks to everyone who sent this in!)