Weird. Since only one class has graduated under the new P/F curriculum, I wonder if the program director you spoke to was referring to dean's letters of old. They've only seen one round of dean's letters from the new grading system, so maybe he/she misspoke? I'd like to think that neither of our sources would intentionally mislead us.
For what its worth, the student handbook covers clinical grades and their reporting in extensive detail, but there's no mention of reporting pre-clinical grades beyond "satisfactory/unsatisfactory." I know absence of proof isn't proof of absence, but given everything I've read and been told, I'm convinced Emory is true P/F at least for c/o 2015 and beyond.