I was able to get my hands on the iOS 13 beta and I was able to try out carplay. When Apple showed it off, I was wondering how it would look and how would you control it using the Mazda Connect control knob.
I made a short video in my 2016 CX-5 that goes into it a little bit. I like it so far, there is just one annoying thing about it. You can hit Home to go between the old layout and the split screen layout. If you have something highlighted in the old layout and you go to the split screen view and try to move the knob, it will go back to the thing you had highlighted.
But here is the video and let me know if anyone has questions about it.