As some of you might know, Commons does not allow free pictures of recent buildings without freedom of panorama. This leads to many deletions that will be hard to replace when the buildings finally reach PD status, because users have left or are no longer interested in the subject and nobody else remembers those images.
Therefore, emijrp proposed to have some kind of "time capsule", i.e. an image that only becomes visible at a future date.
This would work more or less like page protection. While the picture is invisible, the page associated with it should be editable, but will feature some kind of warning against inserting the picture in articles. The visibility date should be settable by sysops at any time.
After the set time has passed, the picture should become visible and also appear in categories
This feature could work as an extension to be enabled only on Commons, or in MW core if other usages are found for it.