The TestFlight will have a few "rounds". The first one will be exclusive to beta testers, such as contributors, credited individuals, etc, in order to obtain an overall outside experience of the app.
The second round will be public, but with a limited number of users. It might start with 20 users and then cap it at 40 if necessary, in order to get a broader overview of the targeted audience.
The last round will be public and fully released on the App Store.
