Appleが、デベロッパー向けに Xcode 12 beta 5 (12A8189h)、iOS 14 beta 5 (18A5351d)、iPadOS 14 beta 5 (18A5351d)、watchOS 7 beta 5 (18R5361d)、tvOS 14 beta 5 (18J5364d) を配布開始
https://developer.apple.com/news/releases/