I swear, I have it! I refreshed appword and saw the update for the bridge app to version 1.0.0.83. I downloaded, installed, restarted. Then I saw another update for BBM to version 5.0.3.22, so I downloaded, installed, restarted. And it worked. Using BBM on my PB now.
Works on my Torch with OS6, even though someone already posted it worked for their torch. It doesn't seem to be phone/carrier specific if some with a Storm2 can get it, and some with the S2 can't get it.. It doesn't make sense to me.
OS6 6.0.0.534 here with the beta zone BBM 6.0.0.73 and everything works perfectly.
You need to make sure you have the latest BBM installed (5.0.3.22 in app world OR 6.0.0.73 from the beta zone) and the latest bridge update 1.0.0.83 from app world. Once you have those two on your BB, you should be good to go.
If you don't see the updates in App World, try a battery pull. You can also load them directly on the phone from the website on your PC, that's how I got them at least...