I'll wait for the update.
I just got a 13 Pro Max upgraded from a 12 Pro and at first I couldn't get Car Play to work properly. Apple support eventually had me reset my network and device settings.
That a PITA to put my settings back the way I had them. Plus, all my Wifi passwords got nuked. Gone.
Car Play is working, but watch unlock isn't. Which is kinda funny. I ran the public beta of 15 for months using the mask/watch unlock feature and got used to it pretty quick. I go get the newest flagship phone and the feature stops working.
Don't get me wrong, the phone is sweet, and the macro camera is really impressive, but the irony is thick.