According to XDA-Developers, Those users of the Nexus 5, Nexus 7 (both 2012 and 2013 models), Nexus 10 and Nexus 4 devices will receive the Android 4.4.3 update. Those curious users who want to try out your hands at the new update, you can try downloading and installing the OTA. Earlier today, the factory images have been leaked along with the source code of Android 4.4.3 KitKat at the AOSP (Android Open Source Project). Though the official change-log is not available, T-Mobile claims that the Android 4.4.3 KitKat update will bring security enhancements and bug fixes. Furthermore, Google has revealed the screenshots of the Android Dialer unintentionally via Twitter. The new dialer will go official in Android 4.4.3 KitKat and it seems to come with a light colored theme instead of a black and blue theme. Also, it appears like Google has included tweaks to the call history button with another button to its right providing call details rather than connecting a call.