AVICSYNC and CARPLAY are two different things all together.
Tbh when your cell phone is connected you will see the avicsync icon to the lower right it's the car with arrows pointing to and from it.
AVICSYNC will basically complete your navigation features as well as offer additions POI's, weather, map updates etc for a small fee.
CARPLAY will allow Iphone owners to have CONNECTED hands free calling, maps etc with the same icons and layout as their phones.
Most if not all GM VEHICLES will feature iPads and iOS features such as car play as standard issue with new vehicles. So pione