Smartwatches are facing what looks to be an ever-shakier future with Fitbit acquiring Pebble and Motorola opting to miss the launch of Android Wear 2.0. With Android Wear delayed in order to make sure it's actually shippable, Google is continuing to release more developer previews. With DP4 today, Wear adds one-click Google Sign-in and authentication, in-app billing, and more.

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