Many times a page will be ready before it is actually needed (in a perfect world right?). We should be able to schedule the approval of a page (new or updated draft) to avoid having to manually approve it at the right time. Like when there is a new product release and you don't want to show the update until a specific date and time due to legal release requirements.
Vote for this idea. I know a lot of people can make good use of a "scheduled approval" feature.