It's been less than a week since Apple released macOS 10.13.2 High Sierra to the masses, but it's already seeded a new beta for version 10.13.3. Oddly enough, nothing was released for iOS, watchOS, or tvOS, so we may see those later on this week.
It's not unlike macOS release notes to not say much about what's actually in the update. If Apple does indeed release a new iOS beta tomorrow, we'll likely find out more about what's coming in this cycle.
In the meantime, if you're on the macOS 10.13 developer beta, you can grab today's build by going to the Mac App Store and heading to the Updates tab.