These are the stats for the 2007-2008 cycle. It can be a little misleading because it doesn't include the number of students who were actually accepted, only the number of students that matriculated. But if you're IS, I think you got a fairly good shot. The OOS stats are a a bit skewed because the OOS tuition is so high that a lot of students choose to go to other schools.
http://www.med.wayne.edu/admissions/applying/statistics.asp
I've met a fair amount of students who were accepted off of the wait-list, some that were even accepted the week before orientation. So I wouldn't give up all hope, although I wouldn't expect to hear anything before May 15th either (at least that's how it was last year).