Apple looks to have abandoned the rumored 120 Hz ProMotion display for this year's iPhone 12 Pro model. The on again-off again rumor has been vacillating all year but now seems to be definitely off the table with production about to ramp up in the next couple of weeks.
https://www.notebookcheck.net/Apple-said-to-have-dropped-120-Hz-display-for-iPhone-12-Pro-models-ahead-of-production.493024.0.html