This release is significantly faster and contains almost 800 significant code changes. You can now subscribe to a user's content and have it delivered via the notification method of your choice. There's an integrated Twitter-style microblogging service. You can embed rich media into your content. There's a new design, and there are many other changes.
This version includes many new features, including photo galleries, open APIs, enhanced internationalization, a community browser, new theme structure, simpler navigation, improvements to the WYSIWYG editor, OPML output, and more.