I can confirms from firsthand experience that this has occurred. I received a "Ranked to Match" phone call from a chairman at a program within the last 2-4 weeks. The chair said something like, "you are ranked in our top 'x' number of spots," which just happened to be the number of positions they have next year.I don't even know why my posting this has any importance. It hasn't influenced/changed my rank list so far, and I don't really think that it should for anyone.
I think it just depends on the program, and I think the majority of programs do not do this. So if you didn't get a call/email there is no reason to freak out, and if you did then good for you. Obviously, I'm not going to say which program (other than the fact that I did not rotate there) in order to protect myself and the program, so don't bother asking. It is also my feeling that although a lot of programs discuss applicants right after interviews, most programs will not finalize their rank lists until late-Jan/early to mid-Feb after all their interviews have been completed.