Mine has been in review since november. I am taking Cell Bio for MSU now, and am pretty sure I'm gonna drop it. They may very well do more interviews, but I'm not gonna hold my breath!
I don't think Michigan has updated their page in a long time. I was accepted in December and mine still says "congrats i have been selected for an interview". So I would worry about it, I know they are planning another round of interviews in feb-march - good luck to everyone.
I spoke with a doctor that graduated from Michigan last year today. He said, "Trust me, they are not done with the interviews". I am going nuts, but still hopeful!