A quick analysis of the update did not reveal any significant innovations. we this-this is likely a bug fix and security update for the developer to fix macOS High beta.
About macOS 10.13.3 beta
The macOS 10.13.2 SDK provides support for developing macOS apps for systems running macOS 10.13.3. The SDK comes bundled with Xcode 9.2 available from the Mac App Store.
Last month Apple role out 6 beta version for macOS and the macOS High Sierra 10.13.2 update was the stable one. The update has established the work of third-party USB-accessories, and also improved the navigation through VoiceOver.