barb,
I'm not entirely sure that the figures include those who are waitlisted. This number came from someone who had an interview about two weeks after I did. When I was there, I had a smaller number (about 600 acceptances) which I'm pretty sure did not include waitlisted candidates. So, it's possible that the 800 acceptances does not include the waitlist.
MCP tends to offer acceptances to about 2x their actual class size, due to the massive amounts of movement they usually get. I could be wrong, however.