WordPress 4.4. beta 1 is now available for download. You can now set it up on a development site to test its features and help fix bugs.
WordPress 4.4, which is expected to be released on December 8, comes with some distinct features.
Twenty Sixteen is a new default theme with a simple layout and color scheme designed by Takashi Irie, who also designed the Twenty Fourteen and Twenty Fifteen default themes.
WordPress will automatically deliver a more appropriate image to users depending on a variety of conditions like screen size, view port size, and screen resolution.
In addition to YouTube, Flickr, Twitter, users will be able to easily embed rich content from almost any site that supports the oEmbed standard. You will also be able to embed preview of posts from other WordPress sites by directly pasting the URL.
REST API (phase 1)
The underlying infrastructure of the WordPress REST API plugin has been included in WordPress 4.4. Plugin authors will be able to take advantage of this by adding custom endpoints.
Taxonomy term metadata is now included in WordPress 4.4. Developers who are using a plugin to implement term metadata should read this post on how to prepare for the switch. Also, the underlying WP_Term class improves caching when working with terms.
Improved <title> output
wp_title() has been deprecated. WordPress will now handle the rendering of the document title automatically.
Comment queries are now split for performance. Also, the underlying
WP_Comment class improves caching and introduces strong-typing.