What does "Wi-Fi" plan mean? Technically speaking, you should be able to connect the car and the phone via Wi-Fi without needing any Internet connection beyond that. And maps and other apps would work off the phone's data plan.
I was quoting an article and provided the source which states "wi-fi for ongoing connectivity"...Almost all GM (in the states, don't know about other counties) have built in LTE & onstar, but you have to pay to a fee for LTE which creates a wi-fi hotspot...If GM can offer some sort of work around and if that is even possible is beyond me...
Logically, the next round of iPhone rumors is that 3 models will be launched in 2017 and all will have a form of wireless charging which like the Apple watch, may not work with existing PM/QI technology due to a software lock preventing a "handshake"...So if new hardware/software is needed to enable wireless CP, perhaps the MY18 vehicles will add Apple compatible wireless charging and tout the full wireless experience...