So, I asked Alex Kinsella (Product manager and PR at Blackberry) if BBM would be coming to iOS and Android this summer, and he said the following:
— Alex Kinsella (@alexkinsella) August 21, 2013
So from his very detailed answer, I can confirm that a Blackberry employee has indeed let us know that BBM will come to iOS and Android this Summer. As to how Blackberry defines Summer, only time will tell.
The questionable move by Blackberry announced months ago could be delayed based on the the movements they have made over the past few weeks. It seems this move means the existence of Blackberry as a mobile phone maker and OS provider could be numbered? That seems a bit extreme but with the steep decline they are on who knows what could happen next.