I wonder how Australian French will sound like. Given the large distance from France and the influence of foreign immigrants, there will probably be some differences in pronunciation and vocubulary. Maybe also minor grammatical differences, but that's less likely.
Something that will surely be different is the numbering system. In France, it's partially based on the number 20, a remnant of Celtic influence. 70 is soixante-dix ("sixty and ten"), 80 is quatre-vingts ("four twenties"), 90 is quatre-vingts-dix ("four twenties and ten"), and 99 is the extremely cumbersome quatre-vingts-dix-neuf ("four twenties and ten and nine"). French-speaking areas in Belgium, Canada and Switzerland use the much simpler "septante" (70), "nonante" (90) and "nonante-neuf" (99). I am convinced that French Australia will follow this path. The people there might even adopt the typically Swiss habit of using huitante for 80.