Low resolution is easily solved using fractal algorithms, something ED already has. The real problem lies with the surface of the moon. It's not a solid rock like all the other planets we land on. It's more like thick powder, like walking on the beach rather than on pavement. That requires a bit of additional graphical and physics work. Stains built up on the SRV from kicking up all the sandy surface, sand shooting out of the tires if you drive to fast, sand getting stuck in the tire treads, sliding around and creating large detailed tire trails in the ground, etc. From the ED Beyond conference, it's clear that FDev has put a lot more work into texturizing planets. They also want to do better ice planets and make them more authentic, which means they have to work on snowy and icy surfaces. This would mean they have to work on the sand/snow physics problem. Assuming they solve that problem without taking shortcuts, then they should have everything they need to open up the moon to the public and give us a close approximation. But, we will see. If they can pull it off, it's going to open up a lot more possibilities with their terrain engine.