I see this more as "here's some early Apple Car UI that you all can play with and tell us what works and what doesn't, and maybe one of you developers in the audience will make something interesting we can eventually steal".
The concept images are compelling but you won't see this in any new car any time soon.
Alternatively a car could just come with the guts of an Apple TV built in to run an unconnected version of CarPlay when an iPhone is not connected.
I'm an automaker and I want a fancy UI on my dash (like Tesla or EQS). So I put in the big screen and then add the Apple extensions to allow CarPlay 2.
But what do I ship with the car? A cheap and quick UI with basic features, or do I have to write a second fancy UI that looks good in the showroom, on test drives, and when the battery dies in the phone? How much time and money do I spend on that?
If I'm Toyota and shipping cheap Corollas, what kind of screen do I pay for on that car? Triple-wide LCDs aren't exactly a commodity part. So is CarPlay 2 something only for expensive cars?
They're probably working on their new monthly subscription plans for "activating" this feature...