I still think they are building up to a WW2 themed scenario/expansion, but I don't think this will be it since too few of the current leaders are relevant to the period.
They should make a scenario where you are just fighting against all the things that want to kill you in Australia, and the winning strategy becomes to settle on the coast because most of them can't jump onto your boats. With the plot twist ending where a bunch of toxic frogs get you.