WordPress 5.3 Beta 2 is now available with some further polishing of the block editor and Twenty Twenty, the next default theme to be shipped with WordPress. There are some accessibility bug fixes and enhancements to the interface changes introduced in 5.3 Beta 1. 🐛
Of special note: the
register_meta functions (including
register_post_meta) now support the
'array' data types. See Timothy Jacobs‘ post for a code sample that registers a post meta field.
Also, 5.3 will introduce new functions to add the UGC (“User Generated Content”) attribute to links and implement it in user comments.