Here in Quebec, the monday on easter is a national holiday. (Is it in the US ?)
Could this be a strategic time for Apple to be restocking stores and have a cool surprise (new iMac/white iPhone) for the usual tuesday release right after the day off ?
Staff would be 2x as expensive working on bank holiday rates. Also, no couriers will be running so unlikely. Also, making everyone work over easter would be a really good way to piss off all the staff.