Apple、デベロッパー向けに macOS Catalina 10.15.1 beta (19B68f)、iOS 13.2 beta 2 (17B5068e)、iPadOS 13.2 beta 2 (17B5068e)、watchOS 6.1 beta 3 (17S5068e)、tvOS 13.2 beta 2 (17K5068b) を配布開始
https://developer.apple.com/news/releases/