Apple has released iOS and iPadOS 18 for public beta testing, allowing users to try out new features before the official fall release. The public beta is free but comes with some risks, so users should proceed with caution. Some key features include a new home screen layout with customizable options, an updated Control Center with more controls and customization, a dedicated Calculator app with Math Notes, the ability to lock and hide apps with FaceID, and the ability to format external storage drives. Despite some minor issues like app compatibility and restarts, the beta has been stable overall. Users can explore more features like FaceTime control, insights in the Apple TV app, and corrective handwriting in the Notes app. The beta provides an exciting preview of what's to come in iPadOS 18.