Could you give more details as to how you develop with Python? Is it done via PySide? My impression was that you could only use C++/Qt, HTML5/JavaScript or Adobe AIR for BB10. I plan to get a Z10 soon with the intention to port an application from Windows Phone along the way. I was mentally preparing for C++, but if Python works good enough then I may skip C++ altogether (I did some small PySide apps in the past, but this time I'd like to learn QML).