Noket made the plugin that ran the Moon, but he left the server. At one or two points he showed interest in returning to develop plugins, but it never happened, and I don't think it will at this point.
Luis may have worked on the Moon a bit in the meantime, but I forget, as his contributions are many and this one hasn't been a focus I don't think. As it stands right now, the Moon is not being worked on.
We could open it as a fairly normal world that has a different theme but no plugin (no oxygen or gravity alterations). I would personally like to see that everyone follow a guideline to: keep the visible part of landscape/surface fairly intact when building or mining, not build giant spawner/autofarm things, and build within the Moon theme. You know, keep it moony.
Thoughts?