There are no plans to support Symbian as the indicators are that Nokia wish to use the new Windows Phone 7 OS moving forward so they can focus on delivering a great user experience through innovations in the hardware and related services. Right now we are looking to support Android before WP7, simply because Android NDK allows a C++ approach to development, whereas WP7 insists on a C Sharp approach. If this changes, or one of our initiatives work out, WP7 could arrive sooner though right now we are very much focusing on our first release platforms which are Windows, Mac, iOS and Samsung Bada (and shortly after; MeeGo) which will allow you to publish on AppUp, MacSore, AppStore and Samsung Apps. Writing an app once and making money from four stores should keep your bank manager happy while we work on a few more platforms for you
I drink tea, and in my spare time I write software.