Xiaomi phones may be upgraded to telephoto lens capable of as much as 50X digital zoom in the near future. Furthermore, their optical zoom specs may improve considerably in the same generations. This rumor has srung from alleged findings that code in MIUI 11 outlines these functions.
https://www.notebookcheck.net/Next-gen-Xiaomi-cameras-may-have-up-to-50X-digital-zoom.438942.0.html