Here's what I wrote to mazdacustomerexperience@mazdausa.com 2017-Oct 6:
Do you have an availability date for the android auto update? If not, can you confirm that it will be available as an upgrade?
Here's the response I got:
Thank you for contacting Mazda Customer Experience Center. At this time, there is no ETA for when we will be incorporating the AndroidAuto system into our current vehicles, but we will be implementing this technology into our current system when we believe that it meets our company philosophy.
Doesn't sound promising to me.