https://wccftech.com/download-ios-15-beta-and-ipados-15-beta-now-available/

You can now download iOS 15 beta and iPadOS 15 beta for both iPhone and iPad. Here are the different methods you can use to install it.

The opening keynote of WWDC 2021 is done and dusted and we know everything about iOS 15 and iPadOS 15. You can learn more about it here: