MIUI 4.5.9 Full Changelog
[System]
Xiaomi Mi3 WCDMA/CDMA will receive OTA update to Android 4.4 Kitkat (5-4)

[Messaging]
Optimization - Show pop-up notifications when clicking URL in MMS (5-6)
Fix - Sometimes app might FC when enabling cloud messaging in Mi Cloud (4-30)

[Lockscreen, Status bar, Notification shade]
New - Number of an app's notifications shown on it's icon supports third-party customization (4-30)
Optimization - Icons of toggles in the Notification shade (4-30)
Optimization - Status bar style (4-30)
Optimization - Do not support swip down gesture for floating notifications (4-30)

[Home Screen]
New - App names and other home screen elements will automatically change colors with wallpapers (5-7)
New - Support auto-filling blanks after batch deleting icons in home screen editing mode (5-7)
Fix - Sometimes, icons were repeated (5-7)
Fix - Sometimes, icons in the Dock were in wrong order (5-7)

[Music]
New - Support syncing songs to Mi Cloud (Settings - Mi Cloud - Music) (5-5)
Optimization - Use high definition pictures in the online music details page (5-5)
Fix - Incorrect round corners in the online music details page (5-5)

[Weather]
Fix - Bottom half of the main page was blank (5-5)

[Mail]
Optimization - Mail Login page (4-29)
Fix - It would go back to the homescreen after logging into account (4-29)
Fix - Receiver names in the Cc box might show unrecognizable code (4-29)
Fix - Receiver names might show unrecognizable code (4-29)
Fix - Incorrect form in the composing email page (4-29)

[Browser]
New - Show searching results in a new page after choosing Find in page for selected text (5-7)
New - Data saving mode (5-7)
New - Online page text font will change with theme font (5-7)
New - Support WML page (5-7)
Optimization - New kernel supports system theme font (4-30)
Fix - Music would continue playing after being discontinued (4-30)

[Calendar]
Optimization - Month view style (4-29)
Fix - Incorrect page form when creating new events (4-29)
Fix - App would FC when clicking on the location in an event (5-6)
Fix - Sometimes, page moved slowly when swiping (5-7)

[Other]
Fix - Sometimes com.xiaomi.eventreceiver would crash (4-26)

[Xiaomi Account]
Optimization - Guide page style (5-6)

[Security]
Fix - Incorrect system storage in Cleaner - Advanced (5-7)