In my opinon a very clever move from BlackBerry to use and support Qt and qml. The biggest problem of RIM is currently the lack of applications and developers.

Nokia had pranked the majority of their Qt developers and contributors. If BB provides now good support and a new home for all former Symbian / maemo / MeeGo Harmattan developers I'm sure BB will get soon a fast growing AppStore. A very important argument those days.

I hope I can attend the BB Jam event in Berlin, germany. It is about 8 hours away for me, but I hope it is worth the trip.
QNX is not Linux, it sounds to me very closed and there is no terminal. But my N950 will not least forever and currently the BB10 UI looks so familar to MeeGo Harmattan that it is worth to have a detailed look at it. At least I will try to port my MeeGo stuff to BB10 as soon as I get a device in my hands!