According to Redmi product director Wang Teng, Xiaomi is currently working on a new Mi 10 flagship phone. The phone is expected to be the Mi 10 Pro+, going by recent rumors, and could very well break the US$1000 MSRP mark.
https://www.notebookcheck.net/Wang-Teng-Prepare-your-wallets-for-the-Mi-10-Pro.480828.0.html