It is already available for Aquaris E4.5 phone. That's a bit unusual - my phone
was usually served as one of the last devices. So I installed that update. It
was only 90 MB (previous update was over 200 MB, if I remember correctly).
The changes are not too visible but I noticed some nice things:
* Keyboard layout changer in top panel. There was previously no easy way to
change layout of external keyboard. Then Win+Space shortcut was added. Now
there is even an graphical thingy. ;-)
* The Calendar can be synchronized not only with the Google Calendar but also
with the OwnCloud and others.
* It is possible to sync with more or one remote calendar (now it actually
works...).
* More detailed setup of notifications. It is now possible to set if the
notification can be represented by a sound, a vibration, a notification
bubble or if it will be listed in the notification list (all of them or any
of them). For every application which can produce notifications, of course.