Apple built the basic framework for CarPlay as a kit meant to be ported to various QNX deployments. You'll notice every car manufacturer signed up to have CarPlay in their vehicles is using QNX for the in car entertainment.
I suspect Apple's licensing requirements for CarPlay includes being certified by Apple, and probably requires the host device to implement CarPlay using an SDK provided and signed by Apple.
Don't hold your breath for CarPlay on non-QNX devices in the near future. Expect to have to plug in a Lightning cable to use it in first generation devices.
