A pre-release build of Android 4.3 has leaked out for the Samsung Galaxy S4
. The model that this is for (GT-i9505) is the unlocked European version of the flagship Android handset. The Korean OEM is believed to be thinking about releasing the update this month or next. Those who have had the pleasure of using the update say that it is faster than Android 4.2.2 and is lag free. Secure business application Samsung Knox is present along with Samsung Wallet.
Other features include a new QWERTY keyboard, and a reading mode that works with a few apps to make the screen look better. Color reproduction is said to have improved with the Android 4.3 update, text is sharper and there are some minor UI changes. Keep in mind that this is not the finished version of the update and more features could be added before it is complete.