Release Date:
WordPress 4.0 is planned for
August 27September 3, 2014
WordPress 4.0 Release:
[…] For those unaware, for WordPress, version 4.0 sounds like a
“big” version number but it’s just another major release for us, like
3.9 and 4.1, constructed over the same ~4-month release cycle. […]
For WordPress 4.0 features follow http://make.wordpress.org
Planned features at the moment: http://make.wordpress.org/core/2014/05/09/summary-of-5-7-dev-chat-irc-log/