Previous reports from publications like The Wall Street Journal, Commercial Times, The Korea Herald and Nikkei, including high-ranking sources at suppliers such as Sharp as well as research from analyst from Barclays Research and KGI Securities, have predicted that iPhone 8 would come outfitted with a 5.8-inch wraparound AMOLED panel protected by a curved 2.5 glass cover on the front much like the cover glass on the iPhone 6s/7 series of phones which have the slightly curved edges.
However, several sources interviewed by MacRumors think iPhone 8 will have a flat rather than a curved screen due to lower manufacturing cost and better yields.