What do you mean by visuals...? There's a lot more to visuals than just detailed models, textures and lighting. There's room in game physics for the next 30 years at least, which will improve how the game visually looks and realism immensely.. All you see in most games are just solid blocks that you can't interact with without writing special code for every little interaction. This is going to be the next big thing and in the next years this will lead to games looking so much more realistic than this tech demo.
Just like the physics in this game improve the visuals