Welcome, everyone, to WordPress 4.1 Beta 1!
This software is still in development, so we don’t recommend you run it on a production site. Consider setting up a test site just to play with the new version. To test WordPress 4.1, try the WordPress Beta Tester plugin (you’ll want “bleeding edge nightlies”). Or you can download the beta here (zip).

WordPress 4.1 is due for release next month, so we need your help with testing. Here are some highlights of what to test:

• Our beautiful new default theme, Twenty Fifteen. It’s a clean, mobile-first, blog-focused theme designed through simplicity.
• A new distraction-free writing mode for the editor. It’s enabled by default for beta, and we’d love feedback on it.
• The ability to automatically install new language packs right from the General Settings screen (available as long as your site’s filesystem is writable).
• A new inline formatting toolbar for images embedded into posts...

Read more at Wordpress.org (News by wordpress.org)