Android Auto is now live for Lollipop phones and Pioneer head units:
"Google just proclaimed that Android Auto is ready for the masses... or at least the masses that feel like picking up a separate Pioneer head unit and own a device running Android 5.0 Lollipop. In case your memory of the search giant's in-car plans is a little fuzzy, Google wants you to be able to connect your phone to your stereo with a USB cable -- once that's done, you can issue voice commands, sketch out routes and fire up apps like Spotify or Soundcloud."
"Android Auto architecture: Phone runs apps, sends rendered screen to Auto via USB, Auto sends touch events to phone."
music player running on Android 5.0 Lollipop-powered Android phone >> regular USB cable >> Android Auto car audio system: car audio DAC > car audio amp > car audio speakers
cant wait for an nvidia x1 dash!