That's not exactly the case, based on the pattern of past games most of them saw Europe getting the games last, with Australia usually being in the middle.
The only times Australia came last in releases was with Red & Blue and Black & White, and they did get Gold & Silver before the US. I'm sorta speculating the pattern will be the same as most games - Japan > US > Australia > Europe.
In fact, here's the patterns based on the last few games (I'm counting Japan out since it's always first):
Red & Blue: US > Europe > Australia
Yellow: US > Australia > Europe
Gold & Silver: Australia > US > Europe
Crystal: US > Australia > Europe
Ruby & Sapphire: US > Australia > Europe
FireRed & LeafGreen: US > Australia > Europe
Emerald: US > Australia > Europe
Diamond & Pearl: US > Australia > Europe
Platinum: US > Australia > Europe
HeartGold & SoulSilver: US > Australia > Europe
Black & White: Europe > US > Australia
Black 2 & White 2: US > Australia > Europe
Notice how it's almost the same pattern? Australia usually almost always ends up in the middle. Even though some games had a big few months' difference with the international releases, it often ended up with the same pattern except for Red & Blue, Gold & Silver and Black & White.