http://wccftech.com/apple-releases-macos-high-sierra-10-13-1-beta-3-to-developers/

Today,  Apple has seen fit to release the macOS High Sierra 10.13.1 beta 3 to developers. The update arrives a little over a week after the company rolled out the second beta of the firmware and almost a month after releasing the new High Sierra update to the general public. So let’s dive in to see some more details on the new beta update and whether it brings new changes and forward-facing additions to the table.

At this point in time, we can suggest that the update purely focuses on internal bug fixes and performance enhancements. Apart from this, there are various security improvements and under the hood implementations have well for a smoother user experience. However,  there could possibly be some new additions in the beta update that we are yet not aware of. Nonetheless, we will definitely let you guys know as soon as something is discovered.