Google has started to disseminate a new Material Design based UI for the Google Play Store. Besides using Google Sans font, the nab=vigation bar has been moved to the bottom of the screen.
Android Messages for Web gets its own Material UI overhaul too, with dark theme in tow : r/Android
Why Your App Isn't Ready for the New Google Play Design
A new UI is coming soon to the Google Camera app - PhoneArena
Here's how to use the new Google Play Store interface that's arriving now
Google says it will start downranking non-tablet apps in the Play Store
Google Play app gets revamped with new, simpler UI - news
Take a look at the Google Play Store's new UI for individual apps - PhoneArena
Google updates to a cleaner, simpler Play Store design [Updated]
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Google Contacts could soon get a home screen widget that displays text messages - PhoneArena
Google Play Store getting better way to browse device screenshots