For Bluetooth and accessory fans, one big hole in the Windows Phone platform has been the lack of Bluetooth 4.0 Low Energy (LE) support (although Android lags here too). The Bluetooth LE standard allows newer hardware to connect using less energy for transmission, saving battery and allowing continuous background syncing. The most common example today is for Fitbit, which can sync to the iPhone constantly, keeping users abreast of their fitness status.
Recently, Nokia updated the 520, 620, 625, and 720 with the 'Amber' update and that firmware brought with it support for Bluetooth 4.0—so not all is lost. That update allowed the Adidas miCoach app to work with their heart rate monitor accessory. However, for those with the more premium 82x, 92x and 1020 devices, the question was when would we get the update?