Details of a Redmi K30S smartphone have started springing up online, but it appears the brief mystery surrounding the device has been solved with a prosaic answer. It's likely the upcoming Snapdragon 865-powered Redmi K30S is simply a rebadged Xiaomi Mi 10T for the Chinese market.
https://www.notebookcheck.net/Mysterious-Redmi-K30S-smartphone-with-Snapdragon-865-SoC-5-000-mAh-battery-and-144-Hz-display-is-likely-a-rebadged-Xiaomi-Mi-10T.498081.0.html