Would never even consider using Apple equipment in the cockpit, in any manner whatsoever where the failure or inavailability of said could have an impact on flight safety - cheap plastic, consumer-grade crap hardware and Apple reserves the right to tell you what software you can run on it. Would not fancy finding that something I needed had suddenly been forcibly uninstalled prior to a flight! And Apple has a documented history of doing this, EVEN with legitimate apps, for completely arbitrary reasons.
Having maps and plates, moving or otherwise, on a nice tablet-size form factor would be great but like many others I am standing by for a rugged or semi-ruggedized solution that does not come with Apple-inflated pricing and runs Windows/Linux or a custom embedded OS.