Google Assistant in Android Auto?

Is there an expectation that the Android Assistant will make it into Android auto in the future? Android Auto requires a phone to be connected to function properly. Does it use that phones implementation of Google Now (in the Pixel's Case: Assistant) or it's own in the APK. If you guys find it possible (Dieter/Lauren/Dan? whoever is doing the review) can you test this in the review? Will I now have two levels of personal assistants between my phone and car, and separate functionality/lists of commands?