Based on my own use, CarPlay doesn't interest me b/c it requires a hard cable or dock hook up. It's too much of a hassle to have to plug my phone in every time I get in my car then remember to unhook when I arrive at my destination. I have 99% of CarPlay's features in my car now and don't have to unhook anything.
Maybe if Carplay goes wireless but then you have to worry about battery drain. So for me it's a no-go.
On a side note, I do have Siri Eyes Free in my car, which does work with my car's bluetooth. I like it and use it. But crazy thing is if I ask to "start Shazam" or "open Shazam" Siri scolds me "I can't do that while you are driving." BUT if I then pull my phone out while driving, unlock my phone and then ask Siri to "open Shazam" no problem. WTF? How is that safer than me just pressing the voice button on my steering wheel?
It is illegal in almost all states to have any video running in the nav or driver's info panel while the car is in motion. This only extends to what the driver can see. The front passenger can have a private screen as long as it's not in the drivers view.