We just received an update notification on our Sony Xperia Z5 Premium and it was for the Android 6.0 Marshmallow update.

The update is a little over 800MB in size and comes with a number of enhancements from Sony which includes improved privacy settings, all-new camera interface, smart battery life, easy in-app access to stickers in Xperia Messaging and Direct Share.
Here’s a demo rundown of all the updates that Sony added on top of the stock Android 6.0 Marshmallow features:
https://www.youtube.com/watch?v=KQBwy32iI2s

motorola moto e 2nd gen lte (xt1521) android 6.0 is also available.