The post preview button is gone, which was critical to BST ad postings. Forum is also allowing blank posts.
The new editor is WYSIWYG.
What You See Is What You Get.
So as you see it, it shall post. No need to preview as the preview is live. Right in the "Leave a Comment" window.
Saving of drafts is useful, but is the delete draft option gone?
Drafts are auto save. The delete draft option still where it has always been.
Rich Text Editor.
To edit a paragraph's style, hit tab to get to the paragraph menu. From there you will be able to pick one style. Nothing defaults to paragraph.
An inline formatting menu will show up when you select text. Hit tab to get into that menu.
Some elements, such as rich link embeds, images, loading indicators, and error messages may get inserted into the editor. You may navigate to these using the arrow keys inside of the editor and delete them with the delete or backspace key.