The new draft/publish feature is nice in 5x, but there is a lot of screen real estate wasted having the publish/save block on the right side like that. For any collection that has a lot of fields, it quickly becomes useless as it scrolls off the page.
This should be along the top in line with the draft/publish tabs (where there is again a lot of empty wasted UI space) and it should be sticky top so when you scroll down you still have access to the save/publish buttons.