The Snapdragon variant of the Galaxy S4 (GT-I9505) is ready to receive Android 4.4.2 KitKat update released by Samsung.
The new Android 4.4.2 changelog
white status bar icons instead of the multi-colour icons
increase in benchmark scores
camera shortcut directly on to the lock-screen
new emojis support
choice between stock messaging app and Hangouts for SMS/MMS
option for changing default launchers under settings
How to update Galaxy S4 to Android 4.4.2 KitKat
Model name: Galaxy S 4 LTE
Version: Android 4.4.2
Build date: Thu, 13 Feb 2014 11:47:45 +0000
Product Code: DBT
First option is, connect your samsung galaxy s4 to your computer and use Samsung Kies.
2nd option is simply use Samsung’s OTA (over-the-air) service. if you want to follow 2nd option then go to Settings > More > About Device > Software update > Update, to download and install the firmware.