I'm pretty sure I already know the answer, but I think it's still a good question..

Does scheduling a publish on content only ever publish the latest version of the page, so we would need to schedule a publish to make one change and then reschedule or manually save a change to reverse it after the original scheduled publish date?

Without too much digging, that looks to be how it works, but I have a client who would like to have a change on their site for just one day over a bank holiday when no-one is around to manually make a 'rollback' change.

If anyone has any thoughts on the matter, I'd be glad to hear them, but I have a feeling I'll have to make some changes to have some valid dates for various bits of content, which sounds like fun!

Any help/advice appreciated..

Mark