A new patent filed by Huawei may have given us our first look at the Mate 30 Pro. Going by the details of the patent, the device could eschew a selfie camera in favor of a rear secondary display. A triple camera setup may be located at the back of the device, including a periscope lens.
https://www.notebookcheck.net/The-Huawei-Mate-30-Pro-could-ditch-the-selfie-camera-in-favor-of-a-rear-secondary-display.414178.0.html