I'm not really sure what they are trying to achieve with diversifying their messaging system.
Blackberry (formally RIM) really needed a bigger marketing push and awareness with the news OS and phone refreshes. Maybe some new business focused ideas to push at the corporate market.
http://www.engadget.com/2013/09/21/psa-bbm-for-android-available-on-play-store-now-ios-incoming-t/
