https://techcrunch.com/2017/08/30/apple-to-remove-home-button-in-upcoming-high-end-iphone-report-says/

The home button is headed to the trash bin if a report by Bloomberg is to be believed. According to the report, Apple is ditching the button to make room for a larger screen in one version of the next iPhone. Instead of a home button, users will perform actions using on-screen gesture controls involving a sort of dock of icons.

If true this would be the biggest change in iPhone design since the launch of the device in 2007.