WordPress team released first beta of its upcoming version 4 , First beta installation process now include language selection as first wizard which is great . there are many other this that is improved and many new features added to version 4 beta 1 .
Language Selection on Installation : now you can select language on Installation
Previews of embedding via URLs
In editor when you will insert video urls from youtube or wordpress tv it will show you the preview of video .
New Plugin search and Install interface : quick view and details about plugin
Grid view of media Library
Now media library will have gridview with preview modal and you can edit image info and image itself from the modal .
Editing Images from modal
Dedicated panel for managing widget from customizer
there is new dedicated panel for widget customization in customizer menu
Download Load From : https://wordpress.org/wordpress-4.0-beta1.zip
Please Note Its beta version so dont use that in production , use only for testing and development .