Android Wear 2.0 Developer Preview 4 features:
- Seamless authentication - User will now only need to select which account they want to authenticate with and they are done. (Tap a button on the watch that opens an authentication screen on the phone)
- In-app billing - Users can authorize purchases quickly and easily on the watch through a 4-digit Google Account PIN
- Cross-device promotion - Devs can help navigate users to the Play Store on a paired device so they can more easily install their app or open a custom URLs on the phone from the watch
- Swipe-to-dismiss is now back
- Compatibility with Android Wear 1.0 apps
- Other fixes and enhancements
Android Wear 2.0 Developer Preview 4 is now rolling out on the LG Watch Urbane 2nd Edition and Huawei Watch.