I really hope they open up the marketplace to user submitted content soon. They should provide options for the content to either be free or paid and catagories and such.
i think would be great to have people make modular assets for the engine, more materials, charecter models etc or premade scenes. I am not a pro and i do not know how to model and such i am more interested in just doing camera animations and such so while the sample content is nice. having more down the road would be great. We need something kind of like Unities store but of better quality :-p.