supporting WP8 is one of our top priorities! Also Blackberry is interesting – actually, we got some Playbooks from RIM for testing, this week at GDC Europe – follow our blog posts for more news about that 😉
Great that you develop a game with QML already! For Smbian & Meego, you could also use V-Play, with the additional benefit to launch it for iOS & Android too.
Let us know on your progress of your game, we’re looking forward to hearing about it!