In Europe, portrait CarPlay is implemented and running on the roads on the latest Renault cars . They have updated their firmware to v8 ~1 month ago on supported head units.I'd love to see this too, would look awesome playing full screen youtube videos or netflix, but I haven't seen portrait CarPlay yet.
They are yet to implement it in any car. Sure it was announced (dynamic screens), but don't know if they actually went ahead and done it.
Check this out: https://www.youtube.com/watch?v=coSsu4gbI0w