MacRumors published a story that Apple has released the second betas of iOS and iPadOS 14 to registered developers.
Apple Seeds Second Betas of iOS and iPadOS 14 to Developers
Apple today seeded the second beta of iOS 14 to developers for testing purposes, one week after seeding the first beta following the WWDC keynote.
Apple Seeds Second Betas of iOS and iPadOS 14 to Developers
Registered developers can download the beta over the air after installing the proper profile from the Apple Developer Center.