As one of the recipients, I can confirm that Harvard did indeed make admissions calls this Wednesday.
As it happens, however, I think that at the time this thread was created, no calls had yet been made. The prof calling me (co-chair of the admissions committee) said on Wednesday afternoon that "this morning we finally received permission to start notifying admitted students," which -- if I heard it correctly -- seems to imply that all the Harvard "acceptances" on gradcafe before Wednesday were bunk. Yet another reason why we need to have TM up and running quickly...