How to Activate Jelly Bean’s Face Unlock “Liveness Check”
Go to Settings > Security and choose Face Lock as your screen lock, set it up and then as you finish, check the box for “Liveness check.” Now you ...
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Now that you've learnt how to get Android 4.4 Launcher on your Android device, it's time to download and install Android 4.4 KitKat apps and have them on your Android devices running Jelly Bean.
Phandroid managed to extract the new Google Apps in the Android KitKat, from the Nexus 5 factory image, and you may click on the following links to get either of the new Google apps:
Although we have tested all the apps and installed them scucessfuly, but install these new Google apps on your own risk