The Galaxy S10s are Samsung's first flagships in which the front-facing cameras peek right through their high-end OLED displays. However, their future replacements may not even require the cut-out in order to fit around a camera. These panels may provide a full-screen experience by hiding all their sensors underneath them.
https://www.notebookcheck.net/Samsung-s-next-generation-displays-are-set-to-engulf-and-hide-cameras-completely.414571.0.html