Agreed, although I would have preferred a less militaristic Polynesian civ choice than the Maori, or have two Polynesian civs, one being the Maori and one being a less militaristic choice...Unlikely to get two, but a man can dream...They probably should've gone with the Maori, instead of Australia.
Regional representation may have had an influence here, however I think it was a lot more to do with a significant fan-base wanted Australia and willing to pay for Australia as separate DLC. They got to make more money, and lots of fans were happier. Unfortunately I believe that nationalism had an influence in a number of the fans who were wanting Australia in the game, but that's something we expect to see, and have seen it in a lot of cases.I think they wanted to fill the continental mass of Australia, so they must have thought that Australia would be more marketable than the Aborigines.
Maori is definitely a good choice, but I think the inclusion of Australia does not exclude them. We can still wait for Maori.
Personally I'm not thrilled about modern colonial civs...They don't really fit in the game, being that you supposedly start in the neolithic. Also, there are plenty of other choices I would rather see, and Australia has taken a spot that would have otherwise been filled with another choice instead.
Not to worry by the way, Australia wouldn't rule out the Maori, or New Zealand for that matter...Probably makes them more likely.