Go into your apps under settings, select AA, Select Storage, Clear the Cache and the Data and then force stop the app.
Reconnect to your truck and you will see an option to use the new interface. Follow the prompts and you're good to go.
Nope. There is obviously a server side component to this that Google hasn't enabled yet. I'm running the updated app, manually updated Play Services to the latest release but the Settings menu in the app has not updated to the new version so I have no toggle for the new UI.
Tried your steps as well as cleared the cache on Play Services, cleared cache/data on the app numerous times, & rebooted. It's just not there and nothing I can do will enable it.