I applied really late also, like May 30th late and found out I was on the Alternate list during my visit to the school on the 26th of June, this past Wednesday.
During my visit I found out that the Fall 2013 incoming class is at capacity.
Though, with some luck you may be able to squeeze in.
Unlike most schools they do not prioritize the waiting list, so if you're adamant about going this semester or starting in Fall 2014 you can reach out to the Office of
Student Services and see what steps you can take to move forward and set yourself apart from the rest.
Their staff can be found here at this page: http://archive.ssw.umich.edu/current/ossprofiles.html
If it's any help the Student Service Specialists are very helpful and nice.
Anyhow, best of luck and if you ever are near Ann Arbor, it never hurts to set up a visit.