Specifically, I can't wait to see what local developers in developing countries create to improve the lives of people within their communities and societies. With the barrier to entry lower to develop these HTML5 apps (not only concerning the tech stack, but also regarding the cost to buy hardware), I expect the app development community will gain valuable members with more diverse backgrounds and life experiences.
From what I observe in myself and in those around me, I think we are best at addressing challenges we have been personally affected by. Therefore, I think great potential rests in empowering people from all around the world, living in incredibly diverse communities, to create local solutions to local problems.
Mozilla team - keep it up, my friends. I'm rooting for you!