Wordpress 4.1 Beta 1 is now available for download and testing.What’s new in this beta?
New default theme, Twenty Fifteen.
A new distraction-free writing mode for the editor and enabled by default for beta.
Ability to automatically install new language packs right from the General Settings screen.
New inline formatting toolbar for images embedded into posts.
Improvements to meta, date, comment, and taxonomy queries, including complex (nested, multiple relation) queries; and querying comment types.
A single term shared across multiple taxonomies is now split into two when updated.
A new and better way for themes to handle title tags.
Download WordPress 4.1 Beta 1