Sorry if this is old info.
I'm at Mazda service and the service rep clearly stated ACP will be offered as a free upgrade in January. This applies to all 2018 GT and Signature trim CX-9's and Mazda 6's.
If you want the upgrade now, you'll have to pay for it. If anyone has heard conflicting info, I'm just the messenger, LoL. Have a great day.
Thanks for the information! Kind of sucks for me, since I had the touring trim! Rats!
Oh well, its a good thing then I bought the kits already- I am still holding off on the install though.