Just curious, what new stuff would people like to see written for Shadow World? Emer III & IV obviously, but also Artefacts & Lost Tech. Other than that, and taking some ideas from other threads, I think the regular pdf supplement, Creatures of Kulthea, Lords of Kulthea (maybe, some stuff is already in Powers), a Fortresses series and maybe some more city books.
It's probably a tad optimistic to expect Terry to have the time to do everything wanted, but maybe some collaborations would be possible.