Phaser 3.60 Beta 20 is freshly baked and available on GitHub and npm (npm i phaser@beta). Updated TypeScript defs and the Spine 3 Plugin are also included. This release mostly focuses on bug fixes, especially regarding the new FX and the mask system. You'll also find Beta 20 on the Phaser Labs at https://labs.phaser.io/.
https://github.com/photonstorm/phaser/releases/tag/v3.60.0-beta.20
As mentioned previously, we're still coding towards our April 12th release date and it's looking good so far. The final few areas to address are the Video Game Object, completing the FX documentation and perhaps looking at the brand new release of Matter Physics, to see if that will be an easy merge, or not.