• streamlined site editor.
• Block theme previews.
• New command palette.
• Easier pattern creation and syncing.
• New design tools.
• New footnote and details blocks.
• Style revisions.
• Improved performance.
• A reimagined site editor that lets you combine content, templates, and patterns all in one place.
• The ability to preview block themes before making a commitment.
• The ability to arrange blocks and save them in "My Patterns," and options to synchronize your entire site's pattern or customize each one.
• A fast and easy command palette that enables you to access expanded functionality and features almost instantly.
• New tools that help you perfect styles and aesthetic options.
• Audit trails so you can track changes and revisions to your styles.
• Annotations in the new footnote block.
• A details block that lets you hide or reveal content.

There are hundreds of versions of WordPress if you count every maintenance or security version. But major releases go from 1.0, 1.2, 1.5, 2.0, and all the way to the latest major WordPress version, 6.3.