I thin an australian/polynesian expansion could be interesting at some point.
Maybe not right now, but it’s definetely something I would look forward to.
I think it would open new possibilites for new non-cavalry civs. Ofc we can’t just use the eagle warrior there, but we can potentially something similar to the “Falcon Warrior”
And in terms of Aboridinies i again would be really interested in a Boomerang Thrower. Maybe it’s incorrect to show them with homing projectiles, but it would be really cool to have the projectiles flying in a circle I think it could make for a really interesting unique gameplay.
Atm I would be more interestd in some African civs which would be more traditional archer civs, but in general I like the idea of thinking a bit moreoutside the established patterns of the game and disccover new terrain.