If the device that has just been spotted live turns out to be the upcoming Mate 30 Pro, some of the rumors that we heard so far were spot-on. The device sighted in the subway seems to feature a waterfall screen and a square or round main camera setup that was covered by the case — apparently custom-made to hide some key features.
https://www.notebookcheck.net/The-Huawei-Mate-30-Pro-apparently-spotted-in-the-wild.430537.0.html