NTT Docomo, which is a Japanese operator has announced a list of Xperia devices which it expects to update to Android 6.0 Marshmallow. You will expect the list which was gives by the Sony months ago, but its not. this list has some changes. It includes all of the recent Xperia flagships including Z3, Z4 and Z5 series. But the change is that it lacks Xperia Z2 which has identical specifications as the Xperia Z3. Still no date has confirmed for the official release. So stay tuned with XperiBlog for more info. See some official screenshots taken from Xperia Marshmallow.