Not too long ago BGR dropped some details that RIM has been planning on bringing BBM to other platforms (PC, iOS, Android, etc.). In a Q&A developers session at BlackBerry World 2011, one of the questions asked was when BBM would become available on these other platforms. Mike Kirkup, from RIM, was quick to note that RIM had no plans to bring BBM to other platforms. The reason is due to BBM being a central feature to attracting new users to the BlackBerry platform.
If the rumors ever do come to fruition, this would be a complete 360 to what Kirkup has said. Nevertheless, it would be interesting to see RIM bring a type of BBM client, whether it be called BBM or the purchase of a 3rd-party app. Would you want BBM to go cross-platform?