The upcoming Nokia Amber update for Windows Phones is also set to include Bluetooth 4.0 support for Lumia 720, 620 and 520 Windows Phones. According to a leaked slide, Nokia will be explicitly introducing low energy capabilities and support for hardware and accessories. This information came to light from a press event in Hong Kong.
Other improvements noted in the Amber update include altering the temperature of photos, focus times, sharpness when zooming and viewing photos in the Pictures Hub, battery life, glance screen and more. It hasn't been confirmed if the Bluetooth improvements will be hitting the Lumia 92x range of Windows Phones, though we can't imagine Nokia leaving out its premium range of customers.
Rumors have been circulating since Windows Phone 8 launched last year that the new hardware supported BT4.0 but the drivers had yet to be written. Evidently, Microsoft had a lot of work to do in bringing Windows Phone from CE to the NT Kernel, and the lack of Bluetooth 4.0 could be a side effect of that transition. With Bluetooth Low Energy (LE) on board, Windows Phone will be able to connect up to smart watches and fitness utilities like our favorite Fitbit.