Gutenberg is a radical rethinking of the post screen and that means we at Yoast have to rethink how we integrate with it. Some of what we do, our real time content and SEO analysis will still have to be visible all the time. Our snippet preview though, might actually move to a pre-publish workflow, a concept that the Gutenberg team has been thinking about.
None of this is set in stone yet, I look forward to building an integration that works well. I would also love, if you're reading this, your ideas on how we could integrate with this.
Accessibility and Gutenberg
One of the things that we at Yoast worry about is the accessibility of Gutenberg. We have a team member, Andrea Fercia, who's very active as a WordPress contributor. We have freed him up to work on accessibility on this project so it can be merged into WordPress soon without losing the accessibility that the current editor has.
You should really install Gutenberg on a test site and play with it: