I think I remember (from two years ago, so maybe this has changed) that Wake sends secondaries to everyone. And I remember the Wake secondary to be relatively easy, i.e.-no essay. I think they're just trying to be polite and trying to keep you posted about what's going on.
Did they include about 900 names in the "to" field so you can see who else is applying, like a certain other medical school has done <cough...Sinai...cough>?