2021's iPhones are currently projected to turn out as more or less iterative upgrades over their predecessors; on the other hand, these changes might be significant for those with strong feelings about the notches that have dominated this series' displays for so many years. The latest leak, which might pertain to the new Pro model, reiterates existing tips that point to a smaller cut-out for the "13" variant's screen.
https://www.notebookcheck.net/iPhone-13-new-renders-purport-to-confirm-earlier-design-related-leaks.530871.0.html