What other clans and ecosystems will be explored in future movies?

So the 3rd movie, "Fire and Ash", will explore volcanic nature and its environment, there are two other movies left to conclude the saga, and James Cameron wants to explore new regions of Pandora, implying new clans and ecosystems. What other ethnicities would you like to see explored in the next movies? The Omaticayas seem to represent the Amazonian tribes (or that's my impression), the Metkayinas represent the South Pacific people (Maories), and two clans will be introduced this December, the Mangkwan (Ash People) and the Tlalim (Wind Traders) which honestly, I can't relate them to an existing ethnicity from Earth.

If the 5th movie, based on allegations, will take place on Earth, that means the 4th movie will still happen in Pandora, and I wonder what ecosystem we will see. If it's gonna take place in the poles, and explore "Arctic" Na'vis, it would be great to see a representation of Inuits. Or if it's gonna take place in the desert, to see nomadic Tuareg Na'vis travelling with camelid creatures.