Named for the jazz band leaded Benny Goodman, WordPress has just released version 4.0 of it’s content management system. This is the first major numeral step of WordPress since June 2010 so there are bound to be some changes of note.
Below is a video that WordPress has released, demonstrating the changes to the system. Primarily these focus on media (images, video and other embedded content), and minor user interface changes to make the WordPress experience more straight forward.