•• Sony confirms Android 5.1 for Xperia Lollipop will be available … – PC World

Sony had already provided information on planned
 Update to Android 5.1.1 for their own smartphones and tablets with
 Xperia series. Sorry, did not specify the date of commencement of the process
 update. Now we learn, thanks to the Japanese branch
 Sony, that upgrade is expected to start before the end of
 month .

Of course, the first fire on Android 5.1.1 załapią
 the latest in a series of Xperia devices , and only with
 sometimes a new lollipop will be made available for older models.
 The same was the case with the process of updating to Android 5.0
 Lollipop.

Sony will start with the update to Android
 5.1.1 later this month

Japanese branch of Sony also revealed some information about the
 changes that will come with the new firmware and among them worth
 include: additional settings for Wi-Fi and Bluetooth in the center
 notifications, new animations and new icons in the settings menu.
 Changelog, however, include changes in terms of Android 4.4 KitKat, and
 So part of the novelties could occur as early as upgrading to
 Android 5.0.2.

Upgrading to Android 5.1 is planned for Lollipop
 Xperia following: Xperia Z, Xperia ZL, ZR Xperia, Xperia Tablet
 With the Xperia Z1, Xperia Z1, Xperia Z Ultra Compact Xperia Z1, Xperia
 Z2, the Xperia Tablet Z2, Z3 Xperia, Xperia Z3v, Xperia Z3 Compact,
 Xperia Tablet Z3 Compact Xperia T2 Ultra Xperia C3, Xperia M2 and
 M2 Aqua. Sony so far has not revealed plans for
 update to Android M.

»See also:
  Smartphone – Buyer’s Guide

_{Source: xperia blog}