Hey there, I recently bought my new CX-5 and got hold of Mazda South Africa head office about the Android Auto issue.
Their email back to me was that they are currently testing a beta version of both CarPlay and Android Auto and that its almost ready and hopefully for launch in January 2019. They said they still have issues with licensing and will hopefully have that sorted out by then.
They also said I could have it retro-fitted to my CX-5 for around $400 and that it required a new USB (fitted next to the 12v socket in the center console under the A/C controls), a cable and software upgrade.
Hope this helps for now