The update allows a Nokia Lumia handset to connect with the Car-Holder CR-200. This accessory is a cradle that your phone fits into while you are in your car, and provides NFC support, wireless charging and links to certain Nokia apps. The update also lets you view additional battery status information on a Live Tile, and allows you to rename Bluetooth accessories while showing off a fresh new design. The app also provides a quick link to Nokia's website if you need help and an option to reset any Nokia accessory to its original factory setting.
source: WindowsPhone via WPCentral