https://www.techradar.com/news/leaked-google-video-shows-smart-redesigns-for-key-android-apps

Creatives working for Google have released a video that demonstrates the company's Material Design principles, and offers a preview of streamlined new versions of key Android apps.

Adam Grabowski and Nicolo Bianchino have created several videos for other Google redesigns, and published the clip as part of a demo reel on Vimeo. It's since been made private, but was also shared by several Google employees on Twitter, so it appears to be genuine.