Didn't they just switch OSes last year? Blackberry 10 is QNX-based.
-Retracted-
Your correct they did push BlackBerry10 in 2013, but BlackBerry 7 (No clue what happened to 8, and 9) was not an upgrade from 6 and was only available on newer phones. Which leads me to believe 7 was actually the QNX implementation.
OS: Blackberry Tablet (QNX)
From the BlackBerry Tablet page
"Another QNX-based operating system, known as BlackBerry 10, will replace the long-standing BlackBerry OS on handsets after version 7."