Just looked at the overflow pool. A shade over 800 applicants on it which looks like it includes the international applicants. I think that the number is pretty good considering how many applicants there must be.
Interview reports are due February 7, so there is a good chance that the numbers on the overflow list will go down.
For those who haven’t been contacted yet for an interview, keep checking your emails including your spam folder. I had 2 out of 10 applicants have my email to them delayed because it went to spam and I was using my MIT account to send it.