While the sources for the rumors can't seem to agree on their exact screen sizes, most mumblings we've heard over the past few months regarding Apple's plans have mentioned that the company will launch three new phones this year. One of those could be a special anniversary model with an OLED touchscreen - called either iPhone 8 or iPhone X (because it's the tenth anniversary of the original iPhone in 2017). If this version pans out, then it should be joined by an iPhone 7s and a 7s Plus. On the other hand, Apple could go with the usual 4.7" and 5.5" sizes and add a 5" model in the middle....
Source: http://www.gsmarena.com/all_three_2017_iphones_are_once_again_said_to_sport_wireless_charging-news-23312.php