WordPress 5.1 What Does it Mean for Plugin and Theme Developers?

Please test your plugins and themes against WordPress 5.1 and update the Tested up to version in the readme to 5.1. If you find compatibility problems, please be sure to post to the support forums so we can figure those out before the final release.

The WordPress 5.1 Field Guide has also been published, which goes into the details of the major changes.

Do you speak a language other than English? Help us translate WordPress into more than 100 languages! This release also marks the hard string freeze point of the 5.1 release schedule.