All submissions will be considered and you will receive an invitation with appropriate instructions when a beta testing phase will begin.
Beta testing of the Android version will come later this year and will use a distinct registration, through Google+ groups.
Before installing a beta version, please make sure to backup your data:
Settings > Advanced > Backup
In any case, the information you're submitting below is only used on the App Store testing service called Testflight (or alternatively on Fabric (a subsidiary of Twitter) if you only have iOS7 devices for which Testflight is unavailable). It is stored on a Google Form spreadsheet and will never be disclosed to any third party not involved in the beta testing process.