I have a Lumia 920 running the Black update, and a Plantronics bluetooth headset. I can make calls (either normal voice, or via Skype) and talk and listen through the headset. However, all incoming calls don't go to the headset - audio only comes from the phone's speakers.
This is rather aggravating, as whenever somebody calls me on Skype I can't hear them through the headset. Is this a limitation of Skype on Windows Phone 8, or limited to particular headsets?