The upgrade to 4.2 to 4.3 brings in an ample bunch of features including restricted profile, support for Bluetooth Smart (Bluetooth Low-Energy), and the latest 3D graphics via OpenGL ES 3.0. With restricted profiles, users are given full control of their devices while limiting access to some apps, should the user wish to limit them. This also means parental controls. Now, parents can prevent their children from accessing explicit content over the Internet.
With support for Bluetooth Smart, users can now connect their Android devices to Bluetooth Smart sensors. Such is the case with fitness devices that use Bluetooth Smart technology. Android 4.3 also accelerates 3D graphics with OpenGL ES 3.0. OpenGL is a cross-language multi-platform Application programming interface (API) for rendering 2D and 3D computer graphics which brings photorealism to a whole new level in the games you're playing.
Android 4.3 also brings a new autocomplete feature in the dial pad, which flashes names or numbers of your contacts on your phone when dialing, saving you time in the process. Google is now rolling out Android 4.3 to Nexus devices.