Not too long ago, A pre-release build of Android 4.4.2 KitKat was leaked for Samsung Galaxy S4 GT-I9505 and now it looks like the Android update season has began as Google has started seeding Android 4.4.2 KitKat for Galaxy S4's Play Edition.
This is the official build seeded by Google to all Samsung Galaxy S4 owner. The update is also available as an OTA update of 57.4 MB and its firmware version is now I9505GUEUCML4. The update is focused on bug fixes and security enhancements especially sealing the security hole related to the way Android 4.4 KitKat was handling SMS transactions.
If you haven't received the notification for the update, be sure to check Settings -> About Phone -> System Updates menu.