Windows Phone 8.1 is now Bluetooth Certified
The approval covers Bluetooth 4.0. This version of Bluetooth includes the Low Energy variant of the technology, which is used for short distance connectivity like that needed to connect a handset to a health related accessory like a heart monitor.
Windows Phone 8.1 is expected to bring virtual voice-activated personal assistant Cortana to the platform, along with separate volume controls, a quick settings menu and an enhanced notifications system.
Thanks, Anonymous Tipster!
source: BSIG via NokiaPoweruser