Stereo Bluetooth (for streaming music) adapter

Atm i have an iphone which is connected with a bluetooth carkit and that works perfect.
i also have an ipod connector installed and an ipod connected to that device. to be able to use that i have to tab the DISC button and i can play tracks from that ipod on the car stereo.

but with iphone 3.0 software release tomorrow (17 june) the iphone now has the stereo bluetooth ability.

So I was wondering if anyone has some experience with installing a stereo bluetooth device on the DISC port.

Kind Regards,
Remco Sonnema