As you might know, WordPress 5.0 with new block editor - Gutenberg - will be released tomorrow. It's just one day before WordCamp US, where Matt will announce the "State of the Word" 2018. It's also just a few days before the Christmas holiday. So, we do not recommend you to upgrade your production sites at this time. In this post, let's see the current state of Gutenberg and its compatibility with Meta Box.