Google’s Material You design is coming to Gmail, Calendar, and Docs on Android

Google has begun rolling out the Material You design system to Gmail and Calendar on Android. This new design will feature changes in navigation bars and action buttons. It also includes Google's Sans text to improve readability. This is part of the larger Android 12 redesign, which includes bigger, more vibrant buttons, smoother animations and overhauls to existing apps.
Pixel devices running Android 12 or later will now be able match the colors of apps such as Gmail, Google Meet and Google Drive with their wallpapers. This will give them what Google calls "a dynamic, personalized look".

It has subtle, but vibrant, changes to Gmail, Calendar, Docs, and Docs. Google has gone further in the rounded corners, so that changes to apps like Gmail, Calendar, and Docs are mainly aesthetic. This means that button placements and core navigation will not be changing.

Gmail, Google Drive and Google Docs have the design changes already in place. These changes will be available in Google Calendar, Google Drive, Google Docs, Sheets and Slides on September 20th. Both personal Google accounts as well as customers of Google Workspace have access to all design changes.