Fro the Match site:
"Programs and applicants may freely discuss any matter and may express a high level of interest in each other. However, programs must not disclose to any applicant or solicit from any applicant information regarding specific ranking intentions. Also, applicants must not request information on how any participating program intends to rank any applicant. The Rank Order Lists submitted by each program and applicant are the sole determinants of their respective order of preferences for the Match."
So I think you could tell a program how you plan to rank them, but they cannot ask how you plan to rank them, and you cannot ask how they will rank you.