Don’t want to spoil your enthusiasm but for people actively developing games right now it is much more important to extend features and performance of the most common platforms. V-Play already supports a lot which is quite amazing and announced WP8 is the right move. Symbian and Asha are basically irrelevant so there would be no real benefit apart from idealism. Besides, Asha is highly unlikely since there is no QT support whatsoever.
Just my 2ct, M