smalltrader:
IMHO I would not bet on this. Apple Car Play and Android Auto require specific HW support. Not having the requisite HW support means replacing the entire head unit which is an expensive exercise.
The US Mazda distributor has been quite specific that, at least in that market, the retrofit will be possible with only a software upgrade or a minor hardware addition. Of course NZ supplied vehicles may not necessarily have the exact same MZD equipment so we will have to wait to see what the local distributor says here.
A side note. Mazda's MZD Connect Navigation System is among the best in business. Personally I don't miss not having Carplay and Android Auto.
I don't really like it. I find it very laggy and mine has had a few weird glitches.