Xiaomi is apparently set to disrupt the iPhone 11 Pro and Mate 30 Pro with the Mi Mix 4, with latest rumours suggesting that the 108 MP monster will be released on September 24 alongside MIUI 11. Xiaomi seemingly has no plans to return to a slider mechanism for the Mi Mix 3 successor either.
https://www.notebookcheck.net/Xiaomi-Mi-Mix-4-Launch-date-and-triple-camera-specs-leak.434379.0.html