I'm using this amazing plug-in and it really helps me, but it have a very little bug that I imagine it's easy to fix.
When I schedule a post for a future date, then I click in the "View post" link, this link sends me to the permalink URL of the blog. But my post it's not published yet, so it returns a 404 error.
My WP Super Cache is configured to threat logged in users like anonymous users, so it serves me a supercache file even I am logged in.
So, if I add a "?preview=true" after the permalink, i can see the page normally.
So, my suggestion is: When a post is scheduled to a future date, add the querystring ?preview=true in the "View" links of the WP Panel.