The following changes will be implemented for Trainers in Australia:

• The maximum number of PokéCoins earned per day will be 50.
• The number of PokéCoins earned from defending Gyms will be six per hour.
• The maximum number of PokéCoins earned per day from defending Gyms will be 30.
• The number of PokéCoins earned per day from completing the featured activities in the Today View will be 20.

Eventually these changes will roll out to the rest of the world. Previous changes can be seen here.