Don't forget we're still missing the entire West Shroud section of the Black Shroud (which still exists lore-wise - an npc in the Gridanian storyline mentions it early on) so it's likely we'll see it in the future. There's also the old 1.0 open dungeon Mun'tuy Cellars that is a whole underground area underneath the Black Shroud (whose entrance still exists as the zone line between the East and South Shrouds). It could easily be added there.

Also I didn't think spriggans were technically even beastmen - all they seem to like doing is eating rocks and throwing thunder spells at me when I'm trying to ride past on my chocobo. ;P