Updates are are strongly recommended and should be seamless for the vast majority of people, otherwise make sure that all plugins are also updated to their most recent version.

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Some of the more notable news

• Fixes several security issues, one critical
• Many subtle improvements to the admin UI
• Lots of Textile improvements and fixes
• Many improvements to admin interface HTML markup and CSS
• Simplified and improved comment preview and input form tags
• Improved error reporting and diagnostics that help tracking down problems easier and faster
• RSS/Atom fixes and improvements (including RSS 2.0 support)
• Automatic support of SSL

Further changes

• Add nowidow attribute to article tags
• Adapt navigation elements to the user’s permissions
• Fixed sending Last-Modified header
• Better indexing for faster article list queries
• Update to tagbuilders
• Show (source of) plugin help before installation
• Improvements in translations (and translatables) (thanks Skubidu and others)
• New translations: Indonesian, Hebrew, Hungarian, Romanian
• Improved handling of comma-separated values in tag attributes
• article, article_custom tags: new sort attribute
• New conditional if_article_id
• author, category, category1, category2 tags: can link to any section by name
• Improved HTML attributes on many tags (class, rel)
• Time and date tags: new attributes for overriding language, GMT
• css, feed_link tags: easier generation of HTML ‘link’ tags
• New link tags: link_category, link_date, link_name, link_url
• Navigation tag improvements (new attributes, improved HTML output)
• Warn if article or comment tags are used in the wrong context
• Stricter 404 checking (missing category, author, messy article ID)
• Simplify and improve comment preview and input form tags
• Improved article load/parse logic on individual article pages
• Workaround some rare FCGI problems with HTTP headers
• Fix some IIS clean URL issues
• Improved multi-edit support on admin pages
• Deprecate old-style PHP tags
• Don’t lose your place in admin lists when returning from an edit
• Extra diagnostic info and pre-flight tests
• Better time zone handling
• Remember and automatically reuse thumbnail size settings
• Textile: fix inline class/style/lang
• Warn when article and comment tags are used in the wrong place
• New if_plugin conditional checks for an active plugin, with optional version number
• Fix an occasional time zone bug
• Fix 404 errors on clean category URLs
• Add backtrace list to error messages in Debug mode
• Added limit attribute to search_result_excerpt tag
• Add escape and default attributes to custom_field tag
• Fix image-upload for outdated gdlib-installations (wet)
• Fix label attribute breadcrumb function (richard)
• Added if_author, if_article_author (with attribute name)
• Allow multiple sections for if_article_section (like for if_section, if_category)
• Display link category’s title, rather than name, in the links page.
• Extend article_image tag to optionally display the article image thumbnail.
• Many minor bugfixes

Further reading

Forum thread for the announcement.