The Google Glass SDK allows to create personalized information with the goal to be perceived on Google Glass. The Google Mirror API is associated with this SDK that contains user interface, patterns, style, and glassware flow designer as the main resources available on the site. Google recommends 4 principles when designing for Glass: don't get in the way (of user experience), keep it relevant, avoid the unexpected, and build for people.
Google is asking developers to update their apps with the latest Android APIs and authentication protocols as it retires some functionality and leaves obsolete tools in the dust. In particular, the Bind_Listener API for Android Wear is being deprecated and OAuth 1.0 is being retired.