It may be that Apple will introduce a small X SE with about at 4.7 inch display in the physical size of the current SE and a 6.1 inch X SE at a physical size just a bit smaller than the 8 Plus. They both would have designs reminiscent of the current SE. Introduced in June, both would feature LCD displays, A11 Bionic Chips, 2 GB RAM, iPhone 8 cameras, made of aluminum, and be offered in 32 GB and 128 GB configurations with or without dual SIMs. The smaller version could easily start at $549.
The 2018 OLED iPhone X and X Plus will feature the A12, have superior cameras, 4 GB RAM, and configurations of 64/256/512. These phones will retain near current pricing with the Plus $149 more.
The two lines will be differentiated by glass and stainless steel vs aluminum, OLED vs. LCD, A12 vs A11, storage configurations, and RAM.
iPhone 7 will be kept and be priced at $399 for 32 GB taking the place of the current SE.
The iPhone X (2017), 8 and 8 Plus, 6S, and SE all discontinued.