Wear OS 7 is a moderate update, but there are a few significant improvements on board. First and foremost, Google promises around 10 percent longer battery life. Full-screen tiles are replaced by Widgets which look and function almost exactly like Android widgets. This should not only make them more versatile and interactive than tiles, it should also make it much easier for app developers to port an Android widget to Wear OS.
Google also wants to standardize workout apps by making the user interface of features such as heart rate measurement or music playback available to third-party apps. Wear OS 7 allows music to be streamed to multiple headphones via Google Cast or Bluetooth. Watch face optimizations are intended to reduce the development effort.