I don't think this is what Scout will be using at all. They will stick to what they are already developing. Car Ply Ultra is Apple's answer to Android Automotive, not to be confused with Android Auto. Regular Car Play and Android Auto display apps running on the phone using the car's screen. Android Automotive and now Car Play Ultra are full operating systems running on the car, used to handle all of the infotainment. Car makers are generally lousy at operating systems, Google has been providing a car oriented version of Android, Android Automotive, for a while and now Apple wants to play too. I don't know all the details but I suspect Google and Apple will supply some apps that the car makers can use if they wish and the car makers can write their own to run on the Google or Apple OS.
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CarPlay Ultra is not an OS.
The primary difference to standard CarPlay because is that it allows layering. This means that some parts of the display are generated by the phone and other parts by the cars computer/OS. Both are integrated together.
Apple also provide a design system and assets so that the car’s OS can render certain parts (such as the speedo) with Apple’s design language and fonts. This gives some people the impression that Apple took over the car. But everything was actually designed by the car manufacturer and mostly runs on their system.
The result is very flexible for the OEM and potentially highly user customizable.