Today HTC One E8 Dual Sim has started getting Android Marshmallow update in India. Software version is 2.33.720.8 and the update will roll-out in two parts.
Android 6.0 comes with many new features like Google Now OnTap,App Permissions, smart battery Optimization Doze as well.
You can see full list of Android 6.0 eligible devices and Release dates By clicking here.
— Ankit Pawar (@ankitpawar24) April 20, 2016