Will World-gen artifacts be able to be of any weapon/armor type, like the fortress artifacts? Or do they only make artifacts of items from their own civ?
While I'm thinking of it, what are the types of artifacts you can get?
It has been implied that besides legendary weapons and armor we can also find holy relics (artifact body parts on display, I assume) and heirlooms, these last ones might cover stuff from crowns and mugs to socks and whatever doesn't fit in the other categories. It is not clear if furniture could be considered heirlooms, or if they'll even be present as world-gen artifacts.
And, aside from the off-site raiding, what will be added in the next version?
Speaking of sites, will there ever be an option for modding custom sites into the games?
Mostly new artifacts and related quests, bugfixes, kobold sites and civ-specific pets, impersonation and new jobs (prophets and spies) and off-site dwarven shenanigans. Those are the ones that come to my mind, there might be a few left.
It will be possible, in a far future, but it won't make sense to have the ability to customize those sites if sites themselves are lacking. Property, law, magic, economy and starting scenarios all have to be implemented first in order to have at least a full bench of
generic sites, to put a name on them.