I also am in the "top half" of the waiting list; however, I have a feeling it's quite possibly larger than 20 people. A friend of mine at my school is also wait-listed. His letter did not mention his standing, simply that he was wait-listed (which I suppose means he will not receive an offer before the people in the top half). Anyway, we represent two students from a smaller school. I seriously doubt my friend and I account for a tenth of the entire list. I am not getting my hopes up, but I am hoping to be pleasantly surprised.
Thanks,
Ryan