Niantic has updated their site to announced that field testing for Pokémon GO will begin in late March 2016 in Japan only for now. The app is still in development but Android Version 4.3 or higher or an iPhone 5 or higher will be required. Testers that wish to apply will need a Google Account and/or Gmail address and applicants will be chosen via a lottery. The number of testers on iOS though will be greatly limited.

Pokémon GO Field Testing Will Begin in Japan

The Pokémon Company and Niantic will be inviting users to field test Pokémon GO in Japan later this month. The Pokémon GO field test program will give users the opportunity to share early feedback and help improve the Pokémon GO experience. Please stay tuned for information about expansion of the field test to other markets.

Sources: http://www.nianticlabs.com/blog/ and http://pokemongo.nianticlabs.com/