Although some time ago that Android 5.0 was introduced Lollipop, most major Android devices still await their particular catalog dose lollipop.
That is why we have not relaxed when further upgrade plans from major manufacturers, and one that seems to have gone further in their work is Sony, which apparently is already testing Android 5.0 on your Xperia Z3 and Xperia Tablet Z3 Compact.
Source code and binaries have been released almost a month ago, but so far no evidence that the Japanese automaker had started testing a final compilation terminals.
However, as they have seen how not xda-developers, such tests have itself started facing very near Update released at least for the Xperia range Z3, which are terminals which seems testeándose Android 5.0 with new Xperia UI.
Compilation passes the detected 23.0.1.XXXX numbering KitKat belonging to Android 4.4.4, the new 23.1.XXXXX which is already based Lollipop 5.0 Android. Specifically, Z3 Xperia 23.1.A.0.99 install version, while the Compact Tablet Xperia Z3 has been the 23.1.A.0.131.
For now, obviously, the new firmware from Sony is still in beta and has not even been distributed by the network for study, but probably in a few weeks the Japanese company start distributing your final update to Android 5.0 for its Xperia past.