Afaik one of the main benefits will be brighter screens or less work for the backlight. Therefore it seems quite likely that they would show up in mobile devices.
The major issue is that it is only tech from one company. Apple in the past always tried to source thinks from two at least. If they go IGZO, they would loose that benefit and could only switch every other generation.
That is why I think other companies will use it first (HTC One does afaik) and eventually Apple will jump in.