The biggest improvement is the switch to Android Kit Kat, meaning developers can write apps for Glass using the latest Android SDK. It doesn't bring much in terms of new features right away though — Google points out improved battery life, better reliability, and easier updating in the future
Other features of **te are Photo Bundles, meaning your photos, videos and vignettes from each day are organized in bundles, the ability to reply With photos in Hangouts, an easier way to send feedback to Google (tap on the device info card in Settings and start talking), and voice commands **w being sorted by recency and frequency. Read more...