How to qualify:
If you have existing games published on other mobile platforms (iOS, Android), make sure you list your top titles in the application. Existing games need to have received a minimum 3 star rating, with a significant number of downloads.
Microsoft encourages Unity developers with a great mobile project in the pipeline to apply. Each developer application will be evaluated on its own merits, and your project may even qualify for the AppCampus offer. Note however that evaluation of new projects will take more time.