Today, Apple released new developer beta builds of both iOS 11.1, watchOS 4.1, and tvOS 11.1, just four days after it seeded the last ones. There's nothing new for beta testers of macOS 10.13.1 High Sierra, probably because the last build was already a day behind schedule.
There's not a lot that's new in these particular builds. iOS 11.1 will bring hundreds of new emoji characters as part of Unicode 10.0. This build still has an issue with the front camera on the currently unreleased iPhone X, and there are no new issues that are listed.
The watchOS 4.1 beta 4 release notes don't say anything new. All of the issues there are listed as resolved. As for tvOS 11.1 beta 4, that's not even posted on Apple Developer just yet.
If you're on the developer beta, you can get these through the Settings app on iOS or tvOS, or through the Watch app on your iPhone for watchOS. If you're on the Public Beta Program for iOS or tvOS, you should see these within a day or so.