WordPress 5.1 was released on February 21, 2019. This release adds some new features you should be aware of, here is information from WordPress.org blog:
Version 5.1 of WordPress, named “Betty” in honour of acclaimed jazz vocalist Betty Carter, is available for download or update in your WordPress dashboard.
Following WordPress 5.0 — a major release which introduced the new block editor — 5.1 focuses on polish, in particular by improving the overall performance of the editor. In addition, this release paves the way for a better, faster, and more secure WordPress with some essential tools for site administrators and developers.
With security and speed in mind, this release introduces WordPress’s first Site Health features. WordPress will start showing notices to administrators of sites that run long-outdated versions of PHP, which is the programming language that powers WordPress.
When you install new plugins, WordPress’s Site Health features will check them against the version of PHP you’re running. If the plugin requires a version that won’t work with your site, WordPress will keep you from installing that plugin.
Introduced in WordPress 5.0, the new block editor continues to improve. Most significantly, WordPress 5.1 includes solid performance improvements within the editor. The editor should feel a little quicker to start, and typing should feel smoother.
Expect more performance improvements in the next couple of releases.
There are other notes for developers…be sure to check it out here: https://wordpress.org/news/2019/02/betty/
The site health feature will be great as it should start showing performance issues with old and outdated themes as well PHP versions. Look forward to more updates on this new feature.