To make behavior in Announcements consistent with all other tools in Canvas, there should be a Save & Publish button added. The Save button could then act like a 'Save Draft' feature, as it is in all other tools. There has been much confusion for our instructors because they expect the Save button to work the way it does in all other tools, saving their work but not publishing it. They don't expect it to post the announcement and send notification. Instructors have also expressed the need to save an announcement as they work (sometimes their announcements are very long) and the ability to preview how it looks before sending. That's why I think a 'Save & Publish' is a better choice than just changing the Save button to a Send button.
Added to Theme
Improved functionality for course announcements Theme Status: Identified