The next generation of iPhones - thought to be called the 12 series - have been leaked extensively already. A new leak from Ross Young of the DisplaySupplyChain tips site now claims to fill in some of the remaining blanks. They include the resolutions and sources of their respective displays.
https://www.notebookcheck.net/A-new-leak-fills-in-even-more-detail-on-2020-s-iPhones.465900.0.html
Please, no curved screens, at least on basic 5.4" model. Its impossible to have tempered glass protector on curved screen, they just dont fit as perfectly as on flat screens resulting in not using them at all, resulting in cracked screens. Happened to my Galaxy S8 which I didnt quite baby, but didnt toss around either. Curved screens look good, but they serve no functional purpose.