There is a little bit of precedent for that, as they started using other displays later in the original iPhone. They were still the same basic technology, though. I don't know if they'd make a running change from LTPS to IGZO in the iPhone 5 4G LTE 6th generation. Doesn't seem like it'd be a drop-in replacement (considering the different bezel size).Possibly, maybe the second batch Apple releases after the initial launch