It looks like Google is preparing to release another Android Auto refreshed, codenamed Coolwalk. While not officially released yet, several images of the redesign have emerged online. Google is also testing a Cast app for Android Auto that allows you to mirror your smartphone on your car's display.
https://www.notebookcheck.net/Android-Auto-redesign-leaks-with-more-than-a-nod-to-Apple-CarPlay.597408.0.html