The first plausible iPhone rumor for 2020 has emerged and it looks like it could solve one of the biggest design issues with the current iPhone design. Based on a rumored prototype design doing the rounds at Cupertino, the 2020 iPhone could go truly all-screen with the True Depth camera system embedded into the top bezel.
https://www.notebookcheck.net/First-plausible-2020-iPhone-render-based-on-rumored-protoype-hits-the-mark.435596.0.html
Meizu could cram one camera and a few simple sensors in there, though True Depth is much more complex, Apple should be able to pull this off sooner or later.