Following up on the fifth beta released last week, Apple has posted the sixth beta of macOS Mojave 10.14.4 this morning. At the time of this post, it was only available for registered developers. That will likely change later this afternoon as Apple should be releasing it to those registered in the Apple Beta Program today too. This new beta is build 18E220a for those keeping score at home. If you have a Mac registered as a developer, you can get the new build by going to Settings>Software Update.
macOS Mojave 10.14.4 is mostly focused on bug fixes, security updates, and performance improvements, there are some new features coming with the release. Apple News will be available to those in Canada for the first time with this release. Canadians will be able to read articles in both English and French. Touch ID support has been expanded in Safari in 10.14.4 so you can now use it to autofill browser fields.
Apple has not confirmed a release date for 10.14.4 but it likely will be next week at or shortly after the Apple Event on March 25th. That event is expected to have the new Apple TV subscription service and Apple News subscription service launched.