To recap, Gutenberg Phase 2 will: Be outside of post_content. Focus on customization. Upgrading themes, widgets, & menus. Early version of phase 2 will be in the Gutenberg plugin. Be sure to reactivate it! Last updated: December 9th, 2018Source: Gutenberg Phase 2 Plan Revealed - Gutenberg WordPress Editor
This is the other shoe dropping. The next phase of Gutenberg for Wordpress will need new themes. Unfortunately this is going to effect the Indieweb in even more ways. Will it make Indieweb themes obsolete?
Gutenberg: All your bases are belong to us!