New - weekly ROM for Mi 11 Lite 5G (renoir)
Optimization - Updated Android Security Patch to May 2021 [most of devices]
Optimization - Restored Widevine L1 support [Redmi Note 8] and added a possibility for regenerate L1 key [Mi 9T/Redmi K20, Redmi K30, Mi CC9 Pro/Mi Note 10/Pro; Fingerprint unlock > Fingerprint payments > Widevine (L1)]

New - Support for Mi 10S and Mi 10T Lite

Control center
Fix - Couldn't scroll on Control center toggles in landscape mode

Always-on display
Fix - Date wasn't displayed properly while English was set as system language

New - New photo filters: Chime, Ginger, Mango, Yore, Tangerine, Charlotte

Rear display
New - Added Super power saver support [Mi 11 Ultra]

Next MIUI weekly release will be released on 14 May.
This changelog doesn't mention all changes made by or Xiaomi.