Reports claim that Xiaomi is geared to debut MIUI 13 on December 28. The company is hard at work on it as well, and is prepared to send out the update to a list of 11 devices at launch, with a number of those already having stable builds.
https://www.notebookcheck.net/Xiaomi-11-Lite-5G-and-Redmi-K40-set-for-first-batch-of-MIUI-13-rollout-as-Xiaomi-preps-stable-builds.587474.0.html