I am pretty sure @DocHippie is correct about the numbers as this was also told to us on my interview day as well. Although I think acceptances are going to be closer to 40-45 from what I remember. They will interview 75-100 and the first 3 days of interviews was about 20 people, there were 3 more interview dates left for the first batch: yesterday, today, and Friday..so Im pretty sure that 40 invites in the first batch is not too far off, which means 35-60 left for the remaining which will prob be anytime between May 5th - May 27th (May 28th is final committee meeting), interviews are held Tuesdays, Thursdays, and Fridays only.
@kf014 don't worry that you haven't gotten the email. You have received the interview, they just prob aren't sure of dates as of yet as there are still interviews being conducted from the first group. Everyone who got their banner page updated to show an interview eventually received the email. I know how you feel because I was skeptical myself, but just be patient (I know easier said than done.lol)
disclaimer: this is all information deduced from information from the school, the only way to confirm is with someone in admission, but I hope this info is a little bit useful.