Google is rolling out Android 4.4 KitKat to the WiFi versions of the Nexus 7 (2012), Nexus 7 (2013), and Nexus 10. Google announced Android KitKat last month along with the launch of the Nexus 5.
Users can update the software in the settings menu. The 3G version of the Nexus 7 will get Android KitKat soon. Google has not revealed when KitKat will be released for the Nexus 4.
Some of the new features in Android KitKat includes the ability to say “Ok Google” for the phone to perform commands, full screen album and movie art, immersive display, contact prioritization, enhanced caller ID, message consolidation, etc.
[Source: Pocket Lint]