PHP 8
Apparently some of the deprecations will make this the most backward compatibility breaking version jump of PHP since V4 to V5. (Read a german interview here: https://www.heise.de/news/PHP-8-im-Experten-Check-Der-erwart...)There's a long report on Wordpress and PHP 8 and it's not pretty: https://developer.yoast.com/blog/the-2020-wordpress-and-php-...