The new beta has a lot of new features, enhancements, and quality of life improvements. Some highlights are AI in the builder, a unified manager for templates and components, export and import of the full design system, customize and save builder layouts, better WooCommerce support and version 2 elements, custom CSS and style controls sync, palate colors synced to Gutenberg, and much more. Check in the change log to find videos for some of these features (like AI).