Bloomberg sources indicate that 2020 iPhone models will feature a new design, with sharp corners and flat edges that hearken back to the iPhone 4S. The Bloomberg report also confirms a number of other 2020 Apple rumors about, about Apple Tags, and 5G iPhone models.
https://www.notebookcheck.net/The-iPhone-12-will-sport-an-all-new-flat-design-in-2020-inspired-by-the-iPad-4-new-5G-models-and-Apple-Tags-also-in-the-offing.461178.0.html
IMO they made a huge mistake at iP6, the design change cheapened the whole series. It definitely took them a while but at least they're back to their best.