Gutenberg 2.8 was released officially on May 4. This was a “polish more” release, but it still included some new additions like a “Spacer” block to create empty areas and a server-side render component. There are some nice improvements to the color palette component too.
Zach Silveira has created Gutenblock which allows developers to create Gutenberg blocks inside WordPress with “hot reloading, code splits, and registering blocks automatically.” It's still under development, but the demo video is impressive.
10up is conducting a professional usability study on the current build of Gutenberg. They are looking for user testing candidates, so if you are interested and meet the criteria, consider filling out the application to participate.
cssigniter.com talks about how to use external React components in your Gutenberg blocks.
If you are a Genesis developer, you will want to review “Gutenberg in Genesis” at Sridhar Katakam‘s tutorial site. Sridhar shows how to add support for Gutenberg in Genesis themes and style the blocks to match the rest of the site on the frontend.