OPPO may have registered a new phone design with the World Intellectual Property Office. As with the Find X, this device hides its front-facing sensors behind an edge-to-edge screen. Unlike the existing flagship, however, this part of the phone involves a discrete part of the rear panel that slides upwards.
https://www.notebookcheck.net/OPPO-reportedly-files-for-a-particularly-striking-slider-phone-patent.428641.0.html