Less than a week after the first beta was released to developers, the second beta of MacOS Mojave 10.14.2 has been seeded for testing. The update is build 18C38b and for those developers who have a Mac registered in the program, you should have the update available to you. You can check for that update by going to Settings>Software Updates.
Much like the first beta, there is nothing new to report from a feature or functionality perspective. This build of MacOS Mojave is very much a maintenance build, with the focus on bug fixes and other improvements under-the-hood. This is normal for most Apple sub-dot releases.
Apple has not indicated on when we can expect 10.14.2 to land in the public channel. Given the normal cadence of beta builds for each release, it will likely be another two to four weeks. That pegs the update for a mid-December release.
If you are a developer and want to register for the developer beta program for MacOS Mojave, it is easy to do. A developer account is $99 and will give you access to these beta builds of MacOS. To get more details, you can go to the Apple Developer site.
Despite being a maintenance build of MacOS, it is not recommended to run the beta builds in production or on your daily driver MacBook.