WordPress 5.6, the final major release planned for 2020, comes out today, on December 8, 2020. It includes a few major features and updates, as well as a huge number of minor enhancements and bug fixes. A few changes have immediate implications for security and compatibility which Ram Gall of Wordfence has highlighted in this post.
The post is focused on the items that are most likely to cause security issues: application passwords, jQuery library update, automatic version updates, and some others.