Pokemon GO will go into a Beta test soon prior to the release this year. Right now, for a limited time, you can pre-register for your chance to be a part of this beta test! The registration period could end at any time so be sure to go now if you want a shot. Beta testers would get a look into the game before everyone else, whether you're on Android or iOS. However, be sure not to share the secrets of what lies inside prior to the game's actual release!
This is open to the United States, Australia, and New Zealand.