Well, nothing about it on the help pages and it looks like the only permission they have is to edit interactive maps; whatever those are. I would have guessed it is for the Maps extension but some testing suggests that isn't the case. Perhaps it is for an extension Fandom is considering adding. They might have created the group for Community Council or some other beta testers to use.
Edit: Actually, if it were for Community Council, they could have just added that right to the council group. So it probably isn't that. Either way, it looks like admins also have that right.