This just in: a new update will be unveiled by Sony and it will roll out for the Xperia devices. This update will also fix the Stagefright glitches that were discovered.

Even though the latter upgrade is pretty much based on the Android Lollipop 5.1.1 variant, the build number is enhanced from 546 to 23.4.A.0.580.

These are the following Xperia devices that will receive the update: Xperia Z3 (D6603 variant), Z3 Compact (D5803 variant) as well as the Z2 (D6503 variant). The big release will happen in Three Austria and it will also arrive to Vodafone subbies located in Spain and UK.
…
Read full post here:
https://neurogadget.net/2015/08/18/sony-xperia-z3-z3-compact-and-z2-with-android-5-1-1-lollipop-update-features-and-bug-fixes/12771