Changelog:
For WordPress 3.8 ja
* Update WP Multibyte Patch to 1.9
For WordPress 3.8
Highlights
Introduces a new, modern admin design
A fresh, uncluttered design
Clean typography with Open Sans
Superior contrast and large, comfortable type
Responsive interfaces throughout
Refined, theme management
Smoother, click-to-add widget management
New Default Theme - Twenty Fourteen
Easily create a responsive magazine website with a sleek, modern design.
Feature your favorite homepage content in either a grid or a slider.
Use the three widget areas to customize your website, and change your content's layout with a full-width page template and a contributor page to show off your authors.
For Developers
External Libraries have been updated.
Better RTL support
What's New
General
Replace PNG-based plugins ratings stars with Dashicons for performance gains
Improved help tab text in various screens
Clicking "Check Again" on the Updates screen now provides more immediate feedback
Dashboard
Consolidate several Dashboard widgets to improve readability
Replace the 'Right Now' widget with the new and improved 'At a Glance' widget
Appearance
Introduce 8 new admin color schemes
Improved readability throughout using Open Sans typeface (where supported)
Responsive Toolbar for smaller-screen devices
Leverage Dashicons instead of icon sprites for crisper experience on all resolutions
Big RTL improvements throughout
Make the dashboard more usable on any size device with responsive all the things
Improve the login screen experience for Internet Explorer 8 users
Improve Quick Edit experience for non-English users
Improve the Menus experience for mobile users
Themes
New Default Theme -- Twenty Fourteen
Make it possible to check for any post format assigned to a post with has_post_format()
Better custom background theme support defaults, can now specify 'default-repeat', 'default-position-x', and 'default-attachment' arguments for background images.
Tags for width changed to layout: responsive-layout, fluid-layout, and fixed-layout
New tag: accessibility-ready to denote a theme is aware of accessibility best practices such as color contrast, keyboard navigation, and form/link focus. See WP theme accessibility guidelines.
Theme screenshots' size have increased from 600x450 to 880x 660.
Widgets
New click-to-add interface for adding widgets to sidebars
Improved interface for devices of all resolutions
Better drag-and-drop experience
Accessibility
Make list table row actions keyboard accessible
Improve color contrast throughout the admin
Multisite
Improved performance when deleting users in Multisite
Under The Hood
General
Heartbeat performance and API improvements
A $taxonomy argument was added to each of the adjacent post functions.
Define $is_nginx in vars.php
Apply capital_P_dangit() to the wp_title filter
Make sure ajaxurl is defined in the Customizer
validate_active_plugins() now checks the manage_network_plugins capability instead of is_super_admin()
Allow passing false for the meta_box_cb argument in register_taxonomy() to turn off the meta box display entirely
Make it easier to target video shortcodes by adding a wp-video class to the parent container
Add CSSMin, SASS, CSSJanus, and jsHint to build tools for core development
Bug Fixes
Fix bug where top-level categories were only redirecting if they had no children
Fix bug in wp_get_object_terms() where returned were strings not integers
Fix a bug where passing a null value to meta_query resulted in wonkiness with the comparison operator
Fix "'wp_signups' already exists for query" error after updating a Multisite network
Fix bug in get_bookmarks() caused by missing parentheses
Fix comment_notification_recipients filter behavior so that it is still respected even on comments left by the post author
Fix a date comparison error in dashboard_relative_date()
Fix keyboard accessibility for row actions in list tables.
Fix no-js and accessibility modes in in the Widgets screen
Fix a bug where menus could still be assigned to a non-existent theme location
Silence jQuery Migrate errors in the General settings page
Multisite
Classes
Introduce WP_Screen::remove_option()
Introduce WP_Screen::remove_options()
Introduce WP_Screen::get_options()
Functions
Introduce wp_dashboard_quick_press()
Introduce wp_dashboard_site_activity()
Introduce wp_dashboard_recent_posts()
Introduce wp_dashboard_recent_comments()
Introduce wp_dashboard_primary_output()
Introduce wp_heartbeat_set_suspension()
Introduce wp_star_rating()
Introduce get_theme_update_available()
Introduce wp_prepare_themes_for_js()
Actions & Filters
Actions
Introduce automatic_updates_complete
Filters
Introduce automatic_updates_debug_email
Introduce wp_prepare_themes_for_js
External Libraries
Add a copyright notice to zxcvbn (password strength meter) script
Deprecated
screen_icon()
get_screen_icon()
wp_dashboard_incoming_links_output()
wp_dashboard_secondary_output()
wp_dashboard_incoming_links()
wp_dashboard_incoming_links_control()
wp_dashboard_plugins()
wp_dashboard_primary_control()
wp_dashboard_recent_comments_control()
wp_dashboard_secondary()
wp_dashboard_secondary_control()
no_update_actions()
Miscellaneous
Many unused images were removed from core. See the full list
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