If you were wondering how excited Android developers are for BBM to land on their platform just look at all the third party BlackBerry Messenger applications above.
While the official BBM app is not yet available, the 3rd party apps currently contain info on BBM for Android user manuals, some fakes (using the BBM name), other app notifiers that will let you know when BBM is available, there is also a BBM PIN finder which i’m sure several would use once available.
Check out all the BBM for Android apps via Google Play.