Website Owners and Operators
With version 4.4 WordPress:
Responsive images:
WordPress now takes a smarter approach to displaying appropriate image sizes on any device, ensuring a perfect fit every time. You don’t need to do anything to your theme, it just works.
Embed your WordPress content
Now you can embed your posts on other sites, even other WordPress sites. Simply drop a post URL into the editor and see an instant embed preview, complete with the title, excerpt, and featured image if you’ve set one. It will even include your site icon and links for comments and sharing.
More embed providers
In addition to post embeds, WordPress 4.4 also adds support for five new oEmbed providers: Cloudup, Reddit Comments, ReverbNation, Speaker Deck, and VideoPress.
For the Developers
REST API infrastructure
Infrastructure for the REST API has been integrated into core, marking a new era in developing with WordPress. The REST API provides developers with a path forward for building and extending RESTful APIs on top of WordPress.
Infrastructure is the first part of a multi-stage rollout for the REST API. Inclusion of core endpoints is targeted for an upcoming release.
Term meta
Terms now support metadata, just like posts. See add_term_meta(), get_term_meta(), and update_term_meta() for more information.
Comment query improvements
Comment queries now have cache handling to improve performance. New arguments in WP_Comment_Query make crafting robust comment queries simpler.
Term, comment, and network objects
New WP_Term, WP_Comment, and WP_Network objects make interacting with terms, comments, and networks more predictable and intuitive in code.
As you can see WordPress is moving toward a full application development platform and this release is a major step forward.
I will be covering the new features in the content at rmseo.com. I'll let you know as this becomes available. | 
