OK here is the latest. reading this Post
by Jibi, where it says at teh bottom:
If you are connected to a Bluetooth« enabled headset and a Bluetooth GPS puck, after some time, the connection between your BlackBerry device and the Bluetooth enabled devices might be lost.
Impact: Your device might not maintain a connection to two Bluetooth enabled devices at one time.
So knowing that the BT headset adn teh BT puck did not work together (well I have not tried it since I upgraded the OS) I wanted to test it tonight, and it was a success. The BT headset was working while the GPS was connecting and it resumed after the call was done. So, i say yay, even if it does disconect like it said as a known issue, I am happy untill they hopefully do teh fix in the next release.