The well-known source of leaks @Onleaks has published the supposed design of the iPhone of 2019.
The published images reveal a square camera module that contains three cameras. There are two cameras aligned vertically like the iPhone XS, but there will also be a third camera placed between the two, on the side. Up there is a LED flash and a microphone on the bottom.
OnLeaks claims that the 2019 iPhones are still in the engineering validation testing (EVT) stage, and there could be changes to the design since the phones will not be released until September 2019.