I think this is looking great so far considering it is just the first iteration.

I am guessing that before the final version will be released the Gutenberg team will polish the parts that might be confusing (like for example "Extended Settings" and "Gutenberg" labels mentioned earlier).

Hopefully, in register_post_type() function we will have the ability to disable editor using supports param, then this screen will be useful for post types where the description is not that important.