Email today from Dean Z!! 
I got this as well. What is your speculation on the chances? Everyone I personally know that was on the WL got knocked off, so I'm guessing there aren't many people left on it...
Hard to say...I'm sure we won't know anything definitive until after June 15th, but the language of the email - especially where it reads "...so we have just a few strong candidates remaining..." - leads me to believe the waitlist pool is pretty small at this point.
I can only hope for the best. UMich was my first choice going into this whole process, so I'll be pouring over my reply this evening.