Pokémon GO Australia & New Zealand field test invites will start rolling out today. Niantic will select users based on a variety of factors which may include OS types, experience in real world games and an element of luck. If you’re selected to participate, you’ll receive an email from us with detailed instructions. If you don't receive an email, please be patient as we plan to increase the number of invites over time.
— The Pokémon GO Development Team