The Pokémon GO Development Team announced they are sending out invites for Pokémon GO field testers in Australia and New Zealand. Here's a full message they have shared in the official Niantic blog:
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

Niantic started Pokémon GO field testing in Japan in March 2016. Field testing program gives Pokémon GO game users an exclusive opportunity to share early feedback and help improve the Pokémon GO game. Are you living in Australia or New Zealand? Have you received an invite for the Pokémon GO game field testing? Please share your experience the comments section below.