I have to say after using CarPlay over the weekend on a 1,000 road trip that it is an underwhelming experience.
We would be better off steering clear of it until they get more friendly with the apps on the phone (most aren't supported). First and foremost, I don't know how Tesla could ever support it because it requires your system to communicate directly with your phone - with a hard plug in...having your phone tethered is a pain. Second, it really isnt better in any way at all except for its ability to navigate through your song lists and selecting items and playlists like the phone interface allows. In fact, outside of that, everything else is WORSE than what we have in the Model S interface today - it forces you to use Apple navigation and a reduced version thereof, which is hardly a decent system (no Waze support or any other nav for that matter). Any integration to texts (none for emails) is all really linked through Siri, and ultimately has you reaching for your phone, which of course is tethered...any activity on the phone is mirrored on your screen so if your passenger is navigating through, lets say Pandora, and you need to enter an address, your activity cuts them out of theirs and takes over the screen.
The system isnt thought out - its clunky and proprietary (worse than the iPhone!)....Im having the head until removed and returned to the shop in favor of the old factory system. Count your blessings that Tesla didn't embrace this system!!
By the way, for those looking to integrate Siri with he Model S, thats available today - she can read emails; compose; read text etc, all upon voice command. As long as your phone is plugged into charging, and you have selected 'Allow "Hey Siri" in you settings (settings--> general --> Sir --> Allow "Hey Siri") you can activate that feature at any time by simply calling out in your car, "Hey Siri!",,,of course, your phone has to be connected via bluetooth but it DOES NOT have to be selected as your sound source at the time of your request. In other words you could be listening to the radio and ask Siri a question and she will respond through the phone integration - as if you were carrying on a phone conversation.