Not to deliberately play devil's advocate (I'm bitter too, no worries), but if all the schools that have accepted and waitlisted people are, in fact, done doing so, then this should be considered an early notification from Penn, not a late one. I'm sitting on a pile of implicit rejections, and this notification, impersonal though it may be, makes Penn the first school I can officially scratch off my list. If this is the only notification rejected applicants will receive, that's cold. If not, then I appreciate knowing definitively before they got everything together for the mass rejection mailing/email.
(Of course, does that refund the 80 dollars I spent applying, unaware they would be making only six offers? Welcome home, bitterness.)