Experimental. Dont activate it with the previous Block Editor.
The second version of block editor aims to be faster to use. It displays the list of al blocks in a sidebar and preview the page or post in an iframe with 80% zoom. This package must not be active with the previous version. Both packages are experimental.
Changes are saved into a draft before you can save them.
New layout. Drag and drop feature.
The edit dialog is displayed on block creation