Gutenberg 2.5 was officially released on March 29th, with a heavy focus on new and improved tools to extend and interact with the editor. On the user side, there are updates to shared blocks, font size UI, accessibility, mobile, stability, and many bug fixes.
Matt Cromwell has some advice for auditing your WordPress plugin for Gutenberg.
Rian Rietveld reviews how Gutenberg's acessibility, as of version 2.4. He concludes that Gutenberg still needs extensive work to meet basic standards, and currently it is a “step back,” especially for screen reader users.