A new leak has surfaced, claiming that at least one of the Galaxy Note 10 phones will feature a 90 Hz display. The OnePlus 7 Pro was the first phone to bring that feature to the mainstream market, and it would seem that Samsung has also adopted it.
https://www.notebookcheck.net/New-hands-on-leak-claims-the-Galaxy-Note-will-feature-a-OnePlus-7-Pro-esque-display.428766.0.html