Version 5.8 brings some of the biggest changes we have seen in WordPress since the launch of the Gutenberg editor back in 2018.
The original launch gave us blocks inside posts and pages. This new version is the first step towards blocks everywhere in WordPress.
When you upgrade to 5.8, you'll see a completely new “Widgets” screen. The PublishPress plugins are ready for 5.8, but it really will be useful for you to get a quick tour of what's changed.