The KB articles have the ability to have an expire date.  It would be very helpful to have a way to keep the current KB but have an unpublished version with a start date.  At that time, that would become the main article and the previous would be in the version history.  

Many times we need people to modify a KB and get it ready for a release date but until that time we would want the old KB to still show.  Right now you have to add to your calendar to remember to publish your draft.