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.
New apps for Android Auto and cars with Google built-in
How to Try Out Android Auto 7.9 Right Now - autoevolution
Android Auto Updated With 'Smart Reply' Functionality for Suggested Emoji and Responses
Android version history - Wikipedia
Android (operating system) - Wikipedia
Android Auto 7.8 starts rolling out - 9to5Google
Android Auto 7.6 is now rolling out - 9to5Google
Android Auto 7.6 Might Resolve One of the Most Widespread Bugs Right Now - autoevolution
Android Authority
Google announces Android Auto updates at CES 2024
Google Announces New Android Auto Apps, You Can Already Download Them - autoevolution
Android Auto, Página 46
Android Auto Once Again Forgets It's a Google App - autoevolution
iOS 10 now installed on 76% of active devices, according to Apple's stats - 9to5Mac
New apps for Android Auto and cars with Google built-in