iPhones that finally upgrade to 120Hz displays are thought to debut in 2021. However, their successors might have even more compelling upgrades, a step up to the incorporation of titanium in the Pro models included. JP Morgan Chase is now reportedly solidly behind this idea, and believes it will contribute to a bumper year in revenue for Apple's mobile division.
https://www.notebookcheck.net/iPhones-with-upgraded-titanium-frames-are-coming-but-not-until-2022.552452.0.html