Apple has gone ahead and released the fourth betas of iOS 11.2, watchOS 4.2 and tvOS 11.2. Registered Apple Developers can obtain the new betas from Apple’s Developer Portal or through an OTA update on their devices, with the correct Beta Configuration Profile installed.
iOS 11.2 features support for Apple Pay Cash and SiriKit for HomePod (which is now delayed until next year), other than that it’s mainly under-the-hood improvements.
With watchOS 4.2, you also get support for Apple Pay Cash, but nothing other than that. Just a minor update. There’s a new shortcut button for BlueTooth devices which playing audio, bug fixes and improvements.