Everything got messed up this last weekend. Usually Apple launches iOS, tvOS, and watchOS together on a Tuesday. There is every reason to believe that was the plan this time but a horrible bug causing repeated crashing of iOS devices including flagship iPhones started on 12/2/17 (it was date related) and could be most quickly fixed by launching iOS 11.2 early because it had the fix ready to go, and so 11.2 launched on Saturday unexpectedly. I'm not sure why tvOS launched today (Monday) but I'm fairly certain by tomorrow the final piece, watchOS will be ready to go.
Yeah, macOS 10.13.2 is missing in action as well. Looks like they're still getting everything sorted out after the recent bug/release fiascos. But tvOS 11.2 is out now, so maybe another day or two and we'll see watchOS 4.2 and/or macOS 10.13.2.