It has been reported that MIUI 13's release has been delayed. Apparently, Xiaomi's Android overlay requires additional polishing, meaning the Mi Mix 4 and Mi Pad 5 will likely launch with MIUI 12.5 as OS. Meanwhile, more POCO and Redmi devices have purportedly joined the internal Android 12 beta testing phase.
https://www.notebookcheck.net/MIUI-13-reportedly-delayed-for-further-optimizing-as-more-devices-are-added-to-Xiaomi-s-internal-Android-12-beta-testing.552878.0.html
As an old user of samsung and xiaomi phones i can say that the gap between the two has increased. While samsung managed to produce hardware and software at the same time, xiaomi was left behind. They're focused only on selling phones, while miui software is still on its first steps without any improvement to this date. This will be disastrous for them in the long term
Oh, come on Xiaomi, add Mi 9 lite on the list for getting Android 12! >:(