I have no idea on what are Frontier plans on that end, if they have any plans at all.
We only know that they do have a lot of animal finished models and animations, as well as other animal related-stuff already optimised for the engine from Zoo Tycoon. So that's something that could be used sooner or later in a possible computer standalone game or Planet Coaster expansion/addon.
Yeah I guess it's a good starting point, but I would have thought that anything made nearly four years ago isn't going to cut it stylistically. Either way, i would be hyping on all four cylinders if we got a zoo addon.