https://www.techradar.com/news/the-first-public-beta-of-macos-1014-mojave-is-now-available-to-download

Apple has revealed its latest version of its operating system that runs on Macs and MacBooks, and if you want to try it out, here's how to to download and install macOS 10.14 Mojave Public Beta right now

The final release of macOS 10.14 Mojave will be available later on in 2018. However, if you can’t wait that long, there are ways to download and install macOS 10.14 early, and Apple has just released the first Public Beta of macOS 10.14 Mojave.