Rumors are everywhere. The latest one says Apple has made an order to Samsung for 100 million 5.5' OLED panels for 2017. We can assume the panels are for the new iPhone device.
The information comes from a source in China. Similar informations regarding Apple could be heard in the past (for example from analyst Ming-Cho Kuo).
What is important that the OLED production cost is lower than LCD's. It is interesting to see how the things will work out.