The latest Gutenberg update is out. In the changelog: block conflicts have been resolved, there is new support for custom fields in block attributes, and crash recovery has been addressed.
Omar Reiss brought up Gutenberg while sharing his thoughts on the WordPress JS framework debate and how it will affect plugin developers. Omar suggests the best way developers can cope with the new paradigm is by “providing simple, reliable and flexible ways to extend the interface” and by “mak[ing] sure plugins can integrate well in the first place.” For example, plugins could be restricted to certain areas where they're able to modify the admin interface. Alternatively (or additionally) they could be allowed to modify the admin “under well-defined conditions.”