KitKat Update from Sony

Just now, i saw a Tweet from XperiaBlog that Sony has finally released Android KitKat update for Sony Xperia Z1, Xperia Z Ultra, and Xperia Z1 Compact series worldwide. This is the new updated information about KitKat from Sony:
Android version: Google Android 4.4 (Kitkat)
Latest available software: 14.3.A.0.681
Release started: 2014-03-19

What are the changes? Well, i don't have it yet, but according to the release notes:

• Introducing Android 4.4.2 KitKat with many new features and enhancements
• Updated Camera application and overall tuning to improve the camera experience
• Enhanced email app
• Stability, performance & battery improvements

Also, Sony added this on their build:

• A tweaked Status Bar and Quick Settings – More intuitive and customisable.
• The same launch animation and live wallpaper as the Sony PlayStation 4 adapted across the lock and home screens.
• Sony’s native app portfolio will be updated to the latest versions. This includes Messaging, MyXperia, Smart Connect, Small apps, TrackID, TrackID TV, Sony Select and Smart Social Camera.
• Updated Media apps including WALKMAN, Album and Movies. Better Sony Entertainment Network & PlayMemories integration with a more intuitive UI and faster download speeds. 

Unfortunately, some new features found on Z2 will not make it into Z1 updates such as:

• 4K video
• Timeshift video
• Tap to wake
• Smart call handling
• Smart backlight control
• Glove mode (already included in the Xperia Z1 Compact).

For older devices, please be patient, since Sony is planning to release it on May:

KitKat will hit the Xperia Z, Xperia ZL, Xperia Tablet Z and Xperia ZR from the middle of Q2 2014 i.e. look for it in May.