It goes without saying that the devices on the receiving end this time around happen to be successors in their very own way to the series. They are no spring chickens either where the handset age is concerned, so to see Sony extend support for them until now is definitely a pleasant surprise. May this kind of attitude continue, and hopefully other handset manufacturers will be able to follow suit.
After applying the update, do expect the build number to be bumped up to 14.6.A.0.368. The new software has gone live in only a few regions at the moment, although it is expected to spread all over the world in due time. Expect this update to make the Stagefright vulnerability obsolete, with options for Wi-Fi and Bluetooth in the notification menu thrown into the mix, among others.