MAC ROUMORS
Apple will launch a trio of new iPhone models in 2018, including 5.8-inch and 6.5-inch models with OLED displays and a 6.1-inch model with an LCD display, according to KGI Securities analyst Ming-Chi Kuo.

Kuo believes all three models will be equipped with a full-screen design and TrueDepth camera system like the iPhone X.
In his latest research note, obtained by MacRumors, Kuo added that the 6.1-inch model will target the low-end and mid-range markets with an estimated $649 to $749 starting price in the United States.
Two new OLED models target high-end market; new TFT-LCD model aims at low-end & midrange markets: We believe the major hardware difference in the two new OLED models is size, in a bid to satisfy various needs of the high-end market. The new TFT-LCD model will differ significantly from the OLED models in hardware and design specs (for instance, the PPI will be lower). The primary selling points of the TFT-LCD model may be the innovative user experience of an integrated full-screen design and 3D sensing with a lower price tag (we expect it will likely be US$649-749).
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Source: MAC ROUMORS