The Mi Mix 4 has been a rollercoaster so far. The flagship was hyped up to high heavens but it turned out that most of those rumors were for the Mi Mix Alpha concept phone instead. A recent leak may have led Xiaomi fans to keep faith in the future launch of the Mix 4 but Xiaomi has now doused the flames of those hopes in brutal style.
https://www.notebookcheck.net/Xiaomi-confirms-that-there-will-be-no-Mi-Mix-4-after-all.435797.0.html