MacOS High Sierra 10.13.2 recently Apple released and the company is testing the next system update right now.
Today Apple officially released the second beta of macOS High Sierra 10.13.3. With beta versions, developers can prepare their applications for a new version of the system even before it is released.
To install the update, registered developers can go to Mac App Store and go to the Updates tab. The new version will be waiting for them there. Also, the second beta can be downloaded directly from the site Apple Developer Center.
The new version has just been released, so so far no changes have been found in it. Most likely, the second beta is also aimed at fixing bugs and improving system performance.
The public beta is due out soon and can be downloaded by users participating in the beta testing program. It is not yet known when the final version of the update will be released, but most likely not earlier than 2018.