While there's no official changelog for what's new, an updated version of Android Auto is now rolling out to all users in the form of 7.6.
Android Auto gains one-tap quick replies to messages - 9to5Google
Android version history - Wikipedia
Android Authority
Android version history - Wikipedia
9to5Google: Android Auto 8.7 Rolling Out, Most Users Still Don't Have Coolwalk : r/AndroidAuto
Android Auto Version 7.6 Rolls Out Widely
Android Auto 7.6 is now rolling out - 9to5Google
Android Auto Updated With 'Smart Reply' Functionality for Suggested Emoji and Responses
9to5Google: Android Auto 8.7 Rolling Out, Most Users Still Don't Have Coolwalk : r/AndroidAuto
New apps for Android Auto and cars with Google built-in
Android Auto Update [7.9.6231]- Improved Do Not Disturb Functionality And Dark Mode
Android Auto's massive redesign is finally rolling out to everyone
Google announces Android Auto updates at CES 2024
Android Auto 7.6 is now rolling out - 9to5Google
10 TIPS & TRICKS For Using ANDROID 12