Just a heads up- This may help some of you with this question! I got the call from them for my acceptance on Jan. 22 (designated date), but my scholarship letter was written on January 17th which leads me to believe that they may not rank and accept people ONLY on the designated acceptance dates. However, I was supposed to hear back in December and got the email saying I will be postponed until January because they didn't get a chance to review my complete file. (I interviewed mid Nov).
My point: You may be accepted already! (But they may be waiting until tmr to call you) 🙂
It doesn't make sense they would send it to all of the people they waitlist. Unlike most schools, UM doesn't reject people after an interview and all those who interviews will get waitlisted until the very end- which means EVERYONE who interviewed would get an invitation to second look (if that were the case).