Thank you for putting this together Ahmad! I've been curious how easy it will be to create custom blocks.

I'm glad to see some thought has been given to standard PHP meta boxes with this "Extended Settings" mock up. Not ideal but workable.

One use case I still haven't seen addressed however is when you have a custom post type that doesn't require a WYSIWYG editor at all or at least a much less prominent one. This is not uncommon at all in custom work - take for example a store post type for a store locator. Has anyone see discussion on this topic?