Speaking as an Australian, it kinda bugs me that even in the d20 glut and the modern day kickstarter 3pp explosion, there has NEVER been an Australian-inspired D&D setting or sourcebook, WotC or 3pp, at all as far as I can tell.
(No, I don't count the wallara in Savage Coast or the Abber nomads in Ravenloft's Nightmare Lands, because they were just as insulting and desultory as the old school Vistani, and the only reason they don't get just as much criticism is that they were so obscure and lacking in depth that nobody paid attention to them)
I wish someone would get onto it. I'd almost be tempted myself but I've never published game material ever, and this is a topic that deserves the sort of big, lavish, full-colour hardback treatment which is way beyond my capabilities. Still, if there's any 3pp out there interested in covering this ground, pleeease drop me a line. I know some people who might know some people who could contribute an own-voices indigenous Australian perspective to a project like this...