I'm not aware of any plans to bring BBM Music to the Playbook. It would be cool if they did. I imagine you would be required to pay for a 2nd subscription because they don't allow you to share an account between multiple devices. It might be worth it if they offered a multiple account discount like Rdio.
i am looking at the link on my 9930, so i am not sure, but is this a way to listen to BlackBerry Music on the PB? I see the music store referenced, but not the service i can look later