Last checked and updated on April 16, 2026What Is New in WordPress 4.0
| Category | Key Changes |
|---|---|
| New Features | New Media Grid, Editor Scroll, Language Packs, Embed Previews |
| Improvements | Plugin Search & Installation, Character Set Support, oEmbed |
| Developer Changes | New Query APIs, Theme Customizer, Internationalization |
How did the media library get better?
The media library got a complete visual overhaul. It now displays your files in an infinite scrolling grid, making it much faster to browse large collections.
You can filter by type and date, and details open in a neat lightbox. In practice, this feels less clunky than the old list view, especially when you need to find an image quickly.
What changed for writing and editing?
The editor no longer loses your scroll position. When you edit an embedded video or image, the page stays put instead of jumping back to the top.
They also added live previews for more oEmbed providers. You get a visual preview right in the editor as you paste a link from YouTube or Twitter, which cuts down on guesswork.
Were there any plugin management updates?
Searching for plugins is now more visual. The Add Plugins screen shows larger icons and more information, making it easier to evaluate options without leaving the admin.
The installation process got smoother too. This matters because it reduces friction for less technical users who need to add functionality to their site.
What did developers get in this release?
Query Improvements
New WP_Query parameters landed. comment_count and post_name__in give you more precise control over querying posts.
Theme Customizer API
The Customizer got more hooks for panels and sections, allowing for richer theme options. You can build more complex setting interfaces directly into the live preview.
Internationalization
Support for language packs means themes and plugins can now use the same translation system as core. This simplifies localization for the entire ecosystem.
FAQ
Does the new media grid work with my existing plugins?
Most should work fine, but plugins that heavily customized the old media library list view might need updates to be fully compatible with the new grid UI.
How do the new Query parameters help?
The post_name__in parameter lets you query posts by their slug names directly, which is cleaner than using post__in with IDs. comment_count allows for filtering posts based on their number of comments.
What's the deal with language packs?
Language packs let you install translation files for themes and plugins from the WordPress.org translation server automatically. This means users get updates to translations just like they get updates to the code.
Is there a new minimum PHP version requirement?
WordPress 4.0 continues to support PHP 5.2.4, but it was already recommended to use PHP 5.4 or higher for better performance and security.
Can I customize the new plugin installer UI?
The UI is more visual but the underlying APIs remain largely the same. You can still use hooks to add custom tabs or modify the search results programmatically.