This revelation comes from 9To5Google, who decompiled version 14.52 of the Google app uploaded to the Play Store with lines of code for this feature.
Google says the "summaries will be generated by artificial intelligence, so it's possible there could be mistakes," and you will be able to turn it on/off in Android Auto settings when you want.
Since the strings for this feature were spotted in a beta version of the Google app, it's unclear when it will be available publicly and get a worldwide release.
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