Creation of mobile and web based versatile app

Having worked in the mobile learning and communications space for the last 12 months we have built up a network of clients and contacts that we are sure would benefit from a versatile mobile app service. We think it would be a web based CMS with fixed parameters for clients to drop content such as video, audio, text, quizzes, and live feeds into (a little like like App Baker). There will also need to be a provision for interchangeable features such as colour and corporate logo slots (to meet with brand guidelines). It should be built for web, iPhone, BB and Android - ideally with a central control for all platforms. We are looking for a partner who will undertake the initial build and then provide support to end-users. In return we offer an initial payment for completion + 30% license payment on each sale + opportunities for support and consultancy work.