The new version of MIUI, Xiaomi's skin for Android, is officially open for development, according to an OEM executive. This announcement was made recently at the Xiaomi MIUI Core Experience Annual Meeting. Therefore, this new OS, MIUI 11, is likely to be installed on new Xiaomi flagships when they are released later this year.
https://www.notebookcheck.net/MIUI-11-is-already-in-development.394116.0.html