Este es el "Changelog" (en inglés) que me aparece al actualizar vía OTA:
Contacts
Optimization - Simplified display method of WeChat/Google+ accounts etc. in contacts detail page (04-16)
Optimization - Set QQ as default IM when adding a new contact (04-16)
Optimization - When sending contacts information using SMS, the contact's recently used number will be marked (04-16)
Fix - Sometimes, opening unnamed contacts would cause app to FC (04-15)
Fix - Call logs could be seen in Guest mode (04-16)
Fix - When managing SIM contacts, the app might FC if you reenter it after exiting by pressing the Home button (04-16)
Fix - When adding an extension number to contacts after calling it, the number would show incorrectly (04-16)
Fix - If set a contact's birthday to February 29 without choosing the year, it would show as March 1 (04-16)
Messaging
Optimization - Support recognizing time information in a message and adding it to Calendar (05-21)
Optimization - When writing a new message, cursor will automatically go to text box after choosing a contact (04-23)
Optimization - Show pop-up notifications when clicking URL in MMS (05-06)
Fix - App might FC if chose contacts repeatedly when writing messages (04-23)
Fix - Cannot delete MMS after failed to download its content (04-23)
Fix - Mistakes in showing 'From XX' in the Starred page (04-23)
Fix - Choosing 'Top up now' after receiving the phone bill for SIM card 2 would show the number of SIM card 1 by default (04-23)
Fix - Notification messages' avatars didn't change with themes (04-23)
Fix - Sometimes app might FC when enabling cloud messaging in Mi Cloud (04-30)
Clock / Calculator
Fix - Sometimes alarm clock delayed in ringing (05-21)