Apple released Mojave 10.14.4 Beta 3 yesterday. The install went fine, no problems. It still seems as snappy as ever which is good. There are a couple of new features, the most significant of which is Dark Mode in Safari web pages. If a website offers Dark Mode and you Mac is set to Dark Mode, the web pages for that site will appear in Dark Mode. I have not tested this yet. I am not sure I would want web pages in Dark Mode. I will just have to wait and see.