We're hard at work on this. As @Hans-van-de-Ven-MRA-Master said there was a lot of work to be done on improving the stability of the iOS app. We're now slowly ushering out improved versions to the community, each time in small increments to make sure that if something goes wrong we can immediately revert to an older version. So far it's going very well.
Paralel to this the development and design team has made a preliminary built with a Proof of Ability video. Please note that this is a very conceptual build of the carplay app that isn't available yet.