Rumor has it that Apple is currently preparing iPhone 12 series which include 3 models. The OLED display is supplied by LG and Samsung. According to ETNews, there will be a 5.4 inch iPhone, 6.1 inch iPhone and 6.7 inch iPhone.
As for the 5.4 & 6.7 inch, it will bring Samsung Y-OCTA technology which reduces manufacturing and screen cost without the requirement of dedicated board.
As for 6.1 variant, it will have LCD material due to high cost of OLED panels.
According to iMore, the 2020 iPhone will be powered by Qualcomm X55 5G modem and ditched Intel 4G modem. The new Qualcomm modem is expected to bring improvement in signal quality thanks to its LCP antenna.