An every-so-often Apple leaker who shares tidbits on Twitter, Ice Universe was the first to suggest a 120Hz display is coming to 2020 iPhone models.
Rumor accuracy
Rumor list
2020
October 7
- 2021 iPhone 13 notch will be shorter, link
June 26
- iPhone 12 Pro and iPhone 12 Pro Max will have 120Hz display, link
2019
July 21
- 2020 iPhone may feature 60/120Hz refresh rate screen, link