Some renders and rumors have asserted that the iPhones to be released this year will have triple rear cameras. This, apparently, will necessitate a Huawei Mate 20-esque square module for these sensors. MacOtakara has claimed that its sources in the supply industry has confirmed this rumor.
https://www.notebookcheck.net/2019-iPhones-really-are-going-to-have-square-rear-cameras-new-leak.414552.0.html