Release notes for the 2nd gen Moto 360 detail Doze mode & other Android 6.0 features
Update: Release notes for Moto 360 (first generation) and Moto 360 Sport are now available as well.
Marshmallow for Android Wear was finally announced yesterday and the OTA update for the watches should begin at any moment. Motorola is the first out with release notes on more details about Android Wear 1.4 for their second generation Moto 360.