This morning I had a update message about WordPress 3.9.1 by an email. It is a minor maintenance release. But it includes 34 bug fixes and they say the fixes are very related to multisite networks.
List of Files Revised
readme.html
wp-admin/css/edit.css
wp-admin/css/forms-rtl.css
wp-admin/css/login-rtl.min.css
wp-admin/css/admin-menu-rtl.css
wp-admin/css/wp-admin-rtl.min.css
wp-admin/css/edit-rtl.css
wp-admin/css/forms.css
wp-admin/css/admin-menu.css
wp-admin/css/login.min.css
wp-admin/css/wp-admin.min.css
wp-admin/about.php
wp-admin/user/menu.php
wp-admin/includes/ajax-actions.php
wp-admin/js/post.min.js
wp-admin/js/customize-controls.min.js
wp-admin/js/post.js
wp-admin/js/customize-controls.js
wp-admin/custom-header.php
wp-admin/credits.php
wp-admin/freedoms.php
wp-includes/ms-settings.php
wp-includes/class-wp-editor.php
wp-includes/media.php
wp-includes/js/shortcode.min.js
wp-includes/js/customize-views.js
wp-includes/js/media-views.min.js
wp-includes/js/tinymce/plugins/wpview/plugin.js
wp-includes/js/tinymce/plugins/wpview/plugin.min.js
wp-includes/js/tinymce/plugins/wordpress/plugin.js
wp-includes/js/tinymce/plugins/wordpress/plugin.min.js
wp-includes/js/tinymce/plugins/wpeditimage/plugin.js
wp-includes/js/tinymce/plugins/wpeditimage/plugin.min.js
wp-includes/js/tinymce/plugins/wplink/plugin.min.js
wp-includes/js/tinymce/plugins/wplink/plugin.js
wp-includes/js/tinymce/wp-tinymce.js.gz
wp-includes/js/customize-models.js
wp-includes/js/mce-view.js
wp-includes/js/mediaelement/wp-playlist.js
wp-includes/js/mediaelement/wp-mediaelement.css
wp-includes/js/media-audiovideo.min.js
wp-includes/js/shortcode.js
wp-includes/js/media-views.js
wp-includes/js/customize-views.min.js
wp-includes/js/media-audiovideo.js
wp-includes/js/customize-models.min.js
wp-includes/js/mce-view.min.js
wp-includes/version.php
wp-includes/default-widgets.php
wp-includes/script-loader.php
wp-includes/media-template.php
wp-includes/ms-load.php
wp-includes/css/editor-rtl.css
wp-includes/css/editor.css
wp-includes/css/media-views-rtl.min.css
wp-includes/css/media-views.min.css
wp-includes/css/editor-rtl.min.css
wp-includes/css/editor.min.css
wp-includes/css/media-views-rtl.css
wp-includes/css/media-views.css
wp-includes/widgets.php
Edit:
After writing the post, I checked the new files out. I am very surprised that I found out 165 files removed. Most of them are kinds of css or js. They includes a lot of files related to TinyMCE. I heard several issues of the visual editor on WordPress 3.9. The troubles were maybe related to TinyMCE. I remember TinyMCE 4.0 merged into WordPress Core announce on this January. I think this probably influenced the behavior of the visual editor, so they had this acts. Do you think so, too?
List of Files Removed