I know pretty close to exactly the number of seats left @ DMU, but don't think I should really say. As someone else said, this information is not something that schools are going to tell you.
That being said, I would go on any interview to any school that you are interested in attending. Even when DMU has it's seats "filled" we will still accept others to the point that the class will definitely be filled. After that, I believe that they continue to interview for waitlist spots. You are, however, informed prior to the interview that you are interviewing for the waitlist & have the opportunity to cancel. Hope this helps.
Sure they will give you a rough estimate, but the OP asked how many seats were left. Now, let's put it this way...If you just got your secondary complete & were just now invited for an interview & then proceeded to ask Admissions how many seats were left & they tell you 25 left.
Now...your interview isn't scheduled for another 3 weeks (b/c you just scheduled it) & that means that they are going to be interviewing appoximately 50+ students before you even get there. This would probably weigh a little heavily on your mind & possibly make you consider not going b/c of the lack of seats (especially if you already have another acceptance). Maybe it's just me, but I can completely understand why they are not going to tell applicants the number of seats left.
By the way, ruck...Are you already accepted?
When I called a couple of weeks ago..they said that their class was almost full and not to waste time sending in a secondary since it was soo late