I've been kind of following this for the last 5 years, it seems to need a serious cash injection to be finished (or at least usable) any time soon. To be honest, I haven't seen 5 years worth of development in the latest video, unless all the work is game engine-centric. The actual rendering seems to be pretty much the same as it was 5 years ago.
Also, 5 years ago they released a video showing that those landscapes had a physics engine implemented, I remember seeing a number of spheres released to bounce & roll down a mountain. And also a space station with internal cities and parked spacecraft. I think it's going to be a long time coming guys