At the bottom of the press release they have links to individual OS pages:

* iOS 27: https://www.apple.com/os/ios/

* iPadOS 27: https://www.apple.com/os/ipados/

* macOS: https://www.apple.com/os/macos/

* watchOS: https://www.apple.com/os/watchos/

* visionOS: https://www.apple.com/os/visionos/

* tvOS 27: no link.

* Overview: https://www.apple.com/os/?version=no-hero