haha. It's just an art program. Although a very intuitive and online-connected one. It does not tap into our minds
It means you can make anything you "dream" about (or imagine).
It shows them placing resources designed by other players, and how easy it is to sculpt your own characters and backgrounds, with drag and drop functionality and pull/play mechanisms
Kinda like working with clay in a way.
I saw it on the live stream, and I thought, first, who the heck is media molecule, then I thought, hey that looks really pretty, but then I thought about it, and decided, it's the type of game that would become boring quickly (to me). /shrugs.
If you love creating stuff, it allows you to make animations and movies, which is cool. And you can share/create resources for other players, or borrow resources other players have created as well.