Glad to hear that CarPlay, in some form or other, will be available on whatever my next car will be (actually, whatever my next BMW will be.) Not so happy to see that its GUI will be a screen full of icons. Familiar and intuitive? Yes. Handsfree? No.
I thought Apple was hyping their Siri Hands Free system pretty hard about a year ago. And I hope the CarPlay GUI hasn't completely replaced that. I'd rather say "Hey Siri..." than look down at the dash to hunt-and-peck at identically-sized icons with zero tactile feedback. It's perfect for mobile devices. Terrible for in-car control. But only slightly worse than BMW's iDrive mouse-puck with menu-driven display. And this is why BMW's display sticks up so high out of the dashboard: to put it more in-line with your normal eyes-on-road eye line.
The major cause of distracted driving accidents is *not* cognitive distraction (e.g. texting on a smartphone.) The major cause of distracted driving accidents is inattention, either of the "mind wandering" type or physically looking away from the road. And a screenful of icons absolutely forces you to look away from the road because there's no way to tap exactly the right icon without looking.
So maybe CarPlay GUI is mainly for the front seat passenger. And I'm pretty sure that Apple will keep the Hands Free "Hey Siri..." feature (as in iOS 8 beta.) But sooner or later somebody will try to sue them after they crash while trying to tap on a CarPlay icon.
Here's a little more on distracted driving: http://en.wikipedia.org/wiki/Distracted_driving
My exact point. Most people can not multi-task and in situation which are not life and death, but it is now okay to allow them to do things which will distract them while driving.
What see most time is something who start to drift from their lane and then all of a sudden realize what is going on and then over react to the situation and then swing back or forth or do not realize traffic is slow or stop and I am not talking about a tailgate who can not stop in time, these people have plenty of time they just reacted late. These people scare me on the road since you have no idea what they may do at any given time. I call them unpredictable driver and they cause accident since others around them do not expect them to do what they are doing.