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On August 1, 2013, WordPress Version 3.6, named for Oscar Peterson, was released to the public. For more information on this enhancement and bug-fix release, read the WordPress Blog, the Release Post, and see the Changelog for 3.6.

For Version 3.6, the database version (db_version in wp_options) changed to 24448, and the Trac revision was r24973.

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Highlights

• New Default Theme - Twenty Thirteen
  • Focus on blogging
  • Single column layout with Sidebar / Widgets in the footer
  • Latest Theme Features support, particularly Post Formats and Theme Markup
  • Font-based icons (Genericons)

• Admin Enhancements
  • UI improvements on Navigation Menus Screen
  • Revisions revised to be more dynamic and scalable
  • Autosave and Post Locking
  • Preview Audio and Video on Media Edit Screen
  • In-line login following expired sessions

• For Developers
  • External Libraries have been updated. More Info
  • New audio/video APIs give developers access to powerful media metadata, like ID3 tags.
  • Filters for revisions, allowing you to set the number of revisions ad hoc instead of only via a define. More Info
  • Theme Markup allows themes to choose improved HTML5 markup for search forms, comment forms, and comment lists.
  • Search content for shortcodes with has_shortcode() and adjust shortcode attributes with a new filter.

What's New

General

• Use digraphs for German umlauts in remove_accents()
• Use Ellipses instead of …
• Consistently apply 'register' filter
• Automatically esc_url() the URL echoed by the_permalink()
• Allow developers to specify an Accept-Encoding header in WP_Http::accept_encoding()
• Pass tag object and args array to topic_count_text_callback from wp_generate_tag_cloud()
• Use wp_unslash() instead of stripslashes_deep
• Improve the performance of backslashit() by avoiding regular expressions
• Disallow accidental or negligent deregistering of critical scripts in the admin. Covers jQuery, jQuery UI, Underscore, and Backbone
• Remove the_title_attribute() from anchors with the_title() as text
• Display username (user_login) rather than user_nicename in Toolbar below username

Posts

• The Revision Management UI saw significant improvement
• Shortcode attributes can now be filtered via shortcode_atts_$shortcode hook
• The ability to change post formats was removed from Quick Edit
• A 'not_found' label was added for non-hierarchical taxonomys
• Better UX for dealing with multiple users editing the same content (aka Post Locking)
• Audio/Video support More Info

Media

• Add oEmbed support for Rdio and Spotify
• .webm (video/webm) was added to the MIME types list
• The Media Library can now be sorted by Author name
• Bug fixed where initial gallery link-to setting wasn't applied
• Return from image_downsize() earlier if a custom resize function is used
• Orientation information was added to items in gallery_shortcode()
• New Audio and Video previews are available on the Media > Edit Screen
• Added wp_audio_shortcode() and wp_video_shortcode()

Comments

• Improve wp_list_comments() markup
• Add the ability to use HTML5 input types in the comment form

Appearance

• The Navigation Menus UI got a significant refresh
• The Customizer can now be accessed via the Appearance menu
• Screen options can now be added to the Appearance > Widgets Screen

Plugins

• Prevent plugins from overriding jQuery in the admin
• Prevent plugins with certain filenames from breaking links in the admin menu

Users

• Remove the three default contact methods (AIM, YIM, Jabber) for new installs.
• Pass old roles to set_user_role action
• The workflow for deleting users has been improved

Settings

• Allow any post format to be set as default in Settings > Writing Screen

Accessibility

• Better keyboard/screen reader accessibility in the Nav Menus UI
• Background image's "select a file" link works with keyboard navigation

Under The Hood

General

• Use official MIME types for Windows Media file extensions
• Redirect after save on options-permalink.php to ensure permalinks are fully flushed
• Only show database errors if both WP_DEBUG and WP_DEBUG_DISPLAY are enabled

Bug Fixes

• Strip slashes from passwords sent to new users by email
• Make sure the url returned by post_preview() is filterable with preview_post_link
• Fix handling of '0' as meta_value argument in get_pages()
• Correctly print 'after' data when scripts are concatenated in WP_Styles class
• Properly truncate UTF-8 post slugs in wp_unique_post_slug()
• Avoid PHP notices in Media Library if an attachment parent does not exist
• Fix some tabbing issues on the post editing screen
• Avoid notice by checking for user agent in wp_new_comment()
• Avoid notice in parent_dropdown() by checking if post exists before testing post id
• Prevent an unintended visibility change from "Password protected" to "Public" when updating the post
• Avoid a warning in mb_internal_encoding by making sure we have a charset first
• Fix unnecessarily persistent "pending email change" admin message
• Ensure we strictly compare 'all options' and 'not options' when protecting these special options
• Make sure to reset the modal after gallery insertion
• Add sanity checks on image metadata to avoid warnings
• Avoid an undefined index notice in get_post_type_archive_feed_link()
• Avoid notices when array args are missing in WP_Image_Editor::multi_resize()
• Fix notice in wp_generate_attachment_metadata()
• Avoid PHP notices when deleting or restoring an item that no longer exists

Multisite

• Pass blog_id to the wpmu_drop_tables filter

Classes

• XML-RPC: Return an error for getRecentPosts (mw and blogger) if the user does not have edit_posts
• XML-RPC: Standardize home/site url labels with core labels
• Preserve alpha in WP_Image_Editor_GD when images are not resized
• Make sure WP_Http funnels all redirect requests through WP_Http::request() to ensure the proper transport is used

Functions

• An arg parameter was added for wp_nonce_url()
• Allow paths with two consecutive dots to be passed to home_url() and all related *_url() functions
• Document 7th parameter, $callback_args in add_meta_box()
• Confirm a user exists before deleting them in wp_delete_user() and wpmu_delete_user()
• Return WP_Error from wp_crop_image() if saving has failed
• Bail early with correct WP_Error if invalid post ID passed to wp_insert_post()
• Remove duplicate calls to add_new_user_to_blog()
• Introduce wp_add_id3_tag_data()
• Introduce wp_read_video_metadata()
• Introduce wp_read_audio_metadata()
• Introduce wp_nav_menu_disabled_check()
• Introduce wp_nav_menu_update_menu_items()
• Introduce do_accordion_sections()
• Introduce wp_slash()
• Introduce wp_unslash()
• Introduce wp_is_writable()
• Introduce wp_auth_check_load()
• Introduce wp_auth_check()
• Introduce get_tag_regex()
• Introduce wp_registration_url()
• Introduce wp_heartbeat_settings()
• Introduce wp_mediaelement_fallback()
• Introduce wp_get_audio_extensions()
• Introduce wp_audio_shortcode()
• Introduce wp_get_video_extensions()
• Introduce wp_video_shortcode()
• Introduce wp_embed_handler_audio()
• Introduce wp_embed_handler_video()
• Introduce get_attached_media()
• Introduce get_post_galleries()
• Introduce get_post_galleries_images()
• Introduce get_post_gallery()
• Introduce get_post_gallery_images()
• Introduce wp_post_revision_title_expanded()
• Introduce paginate_content()
• Introduce get_paged_content()
• Introduce wp_revisions_enabled()
• Introduce wp_revisions_to_keep()
• Introduce wp_text_diff_with_count()
• Introduce shortcode_exists()
• Introduce has_shortcode()
• Introduce wp_parse_post_content()
• Introduce wp_remove_object_terms()
• Introduce wp_add_object_terms()

Filters

• Add self_link in self_link()
• Add get_comments_link in get_comments_link()
• Add comments_link_feed in comments_link_feed()
• Add comment_link in get_comment_link()
• Add nav_menu_link_attributes in Walker_Nav_Menu::start_el()
• Add wp_revisions_to_keep in wp_revisions_to_keep()
• Add wp_link_pages in wp_link_pages()
• Add search_form_format in get_search_form()
• Add user_search_columns in WP_User_Query::prepare_query()
• Add wp_http_accept_encoding in WP_Http_Encoding::accept_encoding()
• Add widget_meta_poweredby in WP_Widget_Meta::widget()

Scripts, External Libraries

• Update to jQuery Color 2.2.1
• Update to Backbone 1.0.0
• Update to jQuery UI 1.10.3
• Services_JSON 1.0.3
• Iris 1.0.3
• hoverIntent r7
• MediaElement.js 2.11.1 (New)
• getid3 1.9.7 (New)

Deprecated

• Deprecate wp_convert_bytes_to_hr() in favor of size_format()
• Deprecate get_user_id_from_string() in favor of get_user_by() where `$field` is 'email' or 'login'
• Deprecate wpdb::escape() in favor of wpdb::prepare() or esc_sql()