In reply to Andreas Nurbo.

Independent of other thoughts about the release timeline, or readiness of the new editor, I wanted to reply to your comment about who should have to test it first...

It's been available to activate on wp.com ever since the Try Gutenberg callout was included in 4.9.8. Similarly there are a number of major hosts who have been pre-installing and activating the plugin on new accounts/sites for a while.

There hasn't really been an increase in complaints or support requests because of it. Now maybe that will change with 5.0. Impossible to say for sure. But up to this point, the data from the actual Gutenberg users (over 1/2 million sites) doesn't necessarily support the assumption that there will be a massive surge.