I tried the bluetooth audio streaming when I test drove a 2011 M3.
I didn't have a cable with me at the time and I asked the SA if I needed it to listen to music on my iPhone. He said no and quickly synched the bluetooth with my phone and the car...within minutes I was listening to beautiful digital tunes on the great M3 stereo. Not only that, but my iPhone contacts were uploaded and we even tested a call to my dad. I wanted to spend more time being geeky but I had to go in and place my order
I pick my new M3 up in 7 days and can't wait to play around with the iDrive. I'm a techie by nature and this was a huge selling point for the car.