alasta: ... it's probably not the huge advancement that it's made out to be.
I haven't had time to check it yet, but apparently there's a table near the bottom of this Wired.com article that compares CarPlay to other competing systems.
Of course this is just "version 1.0" and it remains to be seen what happens in future releases (although as someone else said there's going to be the issue of old car-new devices and old devices-new car) ... or whether it becomes another product Apple cancels.