Gutenberg project lead Matías Ventura announced the Preliminary Road to 5.9 on the Make Core blog earlier today. He covered several big picture items, including several sub-points for each. He also linked to a GitHub issue with specific tasks and tickets that need work.
The post covers notes on block patterns, navigation menus, the
theme.json interface (global styles), design tools, and editing flows for block themes. There is a lot of information to take in and enough areas to cover various interests.
The most exciting focus of 5.9 might just be going deeper into responsive…