Yesterday, Apple released iOS 10.3.2, macOS 10.12.5 Sierra, watchOS 3.2.2, and tvOS 10.2.1 to the public, and that can only mean one thing: the first Developer Beta builds of iOS 10.3.3, macOS 10.12.6 Sierra, watchOS 3.2.3, and tvOS 10.2.2 are now available.
Before you get your hopes up, there are no new front-facing features in these updates, as the version numbers indicate. In fact, we know very little about them, other than that they focus on bug fixes and stability improvements.
The notes and known issues for iOS 10.3.3 haven't changed much from 10.3.2, with sections for Managed and shared devices, openURL, SOS, and WebKit. As usual, the macOS release notes don't say anything at all. watchOS 3.2.3 has a known issue related to Xcode, so it's nothing to do with the front end.
The only build that actually lists something that's new is tvOS 10.2.2, and that includes a fix for AirPlay, where the Apple TV would unexpectedly wake from sleep.
Apple's Worldwide Developer Conference kicks off on June 5, so if you're looking for new features, that's where you'll find them. The company is likely to announce iOS 11, macOS 10.13, watchOS 4, and tvOS 11.