Apple、デベロッパー向けに macOS 12.1 beta 2 (21C5031d)、iOS 15.2 beta 2 (19C5036e)、iPadOS 15.2 beta 2 (19C5036e)、App Store
watchOS 8.3 beta 2 (19S5036d)、tvOS 15.2 beta 2 (19K5035d) を配布開始
https://developer.apple.com/news/releases/