Huawei has patented a design for a smartphone that seems to have an under-display selfie camera. However, its other side has an interesting feature: quad sensors in a plus-sign-shaped module. Furthermore, one of the lenses is square, suggesting that it can accomodate cameras for periscope zoom photography.
https://www.notebookcheck.net/Huawei-patents-a-D-pad-shaped-rear-camera-in-a-new-phone-design.495115.0.html