Today, Apple seeded all new betas for iOS 11.2, watchOS 4.2, and tvOS 11.2 to developers. With the fourth macOS 10.13.2 High Sierra beta arriving yesterday, they're all the second ones we've seen this week, since beta 3 was released on Monday.
The release notes don't specify any front-facing changes, and there aren't even any known issues for watchOS 4.2 build 15S5102b. tvOS 11.2 is a small update, and the known issues for build 15K102a are all on the developer end of things, so it's nothing front-facing.
As for iOS 11.2 build 15C5110b, there are some known issues that have to do with the Photos UI API extensions, Vision, Xcode, Foundation, and ARKit, but again, it's nothing consumer-facing. There should also be a fix for iPhone X users whose phone became unresponsive in the cold weather; the fix was made available to non-beta users yesterday with iOS 11.1.2.
As usual, Apple isn't providing any kind of firm release date for these updates; however, with new betas coming more frequently, it should be soon.