The following information is from the WordPress.org blog:
Version 4.0 of WordPress, named “Benny” in honor of jazz clarinetist and bandleader Benny Goodman, is available for download or update in your WordPress dashboard. While 4.0 is just another number for us after 3.9 and before 4.1, we feel we’ve put a little extra polish into it. This release brings ...
Read the full article at WordPress 4.0 “Benny”
Fore more detailed information on the updates, click here to read the Codex information.