Chinese smartphone OEMs like Xiaomi, OPPO and Vivo apparently demanded the development of a 200 MP sensor by the end of 2020, but Samsung could only offer 150 MP for that specific time-frame. The upcoming sensor is supposed to offer 1 inch of effective pixel area, and will integrate Samsung's Nonacell technology with 1:9 pixel binning.
https://www.notebookcheck.net/Samsung-may-launch-150-MP-mobile-sensors-by-Q4-2020.457712.0.html