HTC historically has not been good with software updates, neglecting updates for many phones and not meeting update deadlines, but it’s mostly changed its tune since the launch of the One M7. It has even committed to update the One M7 and One M8 to Android L promptly, and its Google Play edition models will also get the same love.

http://pocketnow.com/2014/06/30/htc-software-update-roadmap