WordPress 4.4 is expected to be released on December 8. WordPress 4.4 Beta 1 is available now.
Planned features are:
Twenty Sixteen — A new default theme for WordPress.
Responsive Images — WordPress automatically delivers a more appropriate image to users depending on a variety of conditions like screen size, viewport size, and screen resolution.
Embeds — WordPress can now embed rich content from nearly all sites that support the oEmbed standard — not just YouTube, Flickr, Twitter, and the like. You can even embed previews of posts from other WordPress sites by pasting the URL on its own line.