Odd coincidence, I read this HN thread and when I checked my email I had an update from Starmourn. A new scifi mud from Iron Realms that launched the end of 2018. I can't say much more about it though. When I signed up to the mailing list ~3 years ago I was maybe too optimistic about the amount of future free time I would have.
I do think that it's interesting that new commercial MUDs are launching. (Well one anyway.)