WordPress 4.4 was released yesterday. You can read the full announcement here.
Items of note include the new theme Twenty Sixteen, oEmbed functionality, and many other behind the scenes enhancements.
If you are updating to 4.4 yourself, please make certain that your themes and plugins are not only up-to-date, but are compatible with WordPress 4.4. A backup of your site is never a bad idea either 🙂
Customers that subscribe to our Maintenance Services will have this update applied in the very near future. Please give us time to test it with your unique site.