The Nikkei Asian Review says that its sources claim that Apple ordered 70 million 5.2" flexible OLED displays for its first OLED iPhone, that will be launched by the end of 2017. IHS estimates that SDC actually plant to produce 95 million OLEDs for Apple in 2017 as it expects higher demand from Apple.
This report follows several reports of Apple's OLED orders in the past years. In 2016 it was suggested that Apple paid $4.3 billion upfront to secure 100 million panels, and in February 2017 it was reported that Apple ordered an extra 60 million OLED panels from Samsung Display.
It seems pretty clear that Apple aims to use an OLED in its next iPhone (at least in the high-end model). TrendForce says that Apple decided to use a rigid glass-based OLED as it was not happy with production yields and drop-test results of SDC's flexible OLEDs.
