WordPress 3.9 “Smith” released on April 16, 2014 includes a number of updates.
Updated Visual Editor
Pasting from a word processor is easier now that styling can be clean up quickly. Generally pasting from Word has been an issue, but now you can keep paste as text active, without having to think about it.
Image Editing
The newest feature allows you to scale images while editing your posts. In addition to cropping and rotating quickly.
Drag and Drop Images to Upload
Now uploading images is easier by being able to grab and drop directly in the editor.
Gallery Preview
Galley appears in the editor just like it appears in your published post.
Audio and Video Playlist
WordPress has now added playlist for audio and video, in order to showcase them in your posts or pages.