I don’t mean to derail, but why on earth would this be developed, doesn’t the car have buttons to do this, what is the practical application of it?
The argument from car companies is that a car lasts 10 years, where as a persons phone is usually replaced every year or two - so by the time the car is 5 years old, the technology in the car is archaic. Additionally people will pay for 3g on their phones, but way less likely in their car. Essentially what this means is car companies can be more innovative and compete around user experience of the car. It also means they can build a community around a set of car APIs, get the developer community involved, leading to better and cooler experiences.
Not saying its necessarily a good thing, but its a nice approach of keeping current. My current car doesn't even have AUX out, so I'm left using a dodgy FM transmitter - so I'm all for them pushing out to other devices.