We're already knee deep in speculation regarding Apple's 2017 plans but why not step it up a bit and move into 2018 territory. Rumor has it that Apple will release three iPhones in 2018 and all of them will have OLED displays. This means that Apple will transition its entire phone lineup from LCD to OLED next year. It also means that Apple will have three different iPhones once more. Some rumors suggest there will be two screen sizes - 5.28" and 6.46", both sporting OLED, so what about the third one? In 2017 Apple is expected to release iPhone 7s and 7s Plus incremental upgrades...
Source: http://www.gsmarena.com/apple_will_make_only_oled_iphones_from_2018-news-26044.php