So we get only one Naakual, one new colonization area, one new type of mob, and nothing else?
Well, if you think about it, there was only one new monster type added for each Naakual area (Craklaw for Foret, Matamata for Morimar, etc), so just one new type for the Drifts isn't that surprising. Likewise, this is just Colonization related stuff for Adoulin. Who knows what other content they'll be adding alongside this.
Well, outside of special circumstances (like Abyssea mobs), recolors haven't been considered distinct mobs by Square Enix, but just variations of existing ones, so they wouldn't have been listed under new mob types. As for the butterfly, just because it's in the .dats doesn't mean they'll be introducing it soon. It might be something coming a long time from now.