I don't know for certain, but I think there's a real potential for new animals coming to WDW, just maybe not the classic mammals.
On one of our recent visits, the staff talked about invertebrates being brought to AK. There has been a significant shift in understanding in recent years when it comes to invertebrates and their role in ecosystems. For many years, the vital role of krill was overlooked, just as honeybees and other pollinators have long been overlooked. Disney would do well to add an exciting invert exhibit.
I suppose it depends how one defines 'major' new habitat, but I could very much see AK adding a really in-depth invertebrate habitat.
It also depends on any new IP Disney creates. If Pixar happened to write a movie about an adorable little freshwater shrimp, hermit crabs, or maybe they will continue the story of Wall-E from the cockroach's point of view.
I could also see AK perhaps adding a year round butterfly pavilion. They already offer one seasonally at Epcot, and they are quite popular.
I could very much see a new AK exhibit focused on climate change, and perhaps looking at animal populations that are especially impacted by climate change. For that matter, I could very much see WDW revising some exhibits in coming years for a number of reasons. Animal care is always evolving; so perhaps 'new' in the sense of replacement.
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