I do think few = very few... But I see only 100 = good news for waitlisters... this would mean that a waitlister actually gets a shot if the R1 interviews don't turn out as favorably as they had hoped for.
So here is the math. Let's say that they had targeted 60% yield on the 800 invites: 800*60%=480. So assume they are looking for 480 admits from R1, now you use that 480 / (800 + 100) = 53%. 53% is still within the range of expected yield. If 50% of the waitlisters get an interview, the yield would be 480 / (800 + 50) = 56%, totally within the range of historical interview/admit yield. Obviously this is a pure statistical argument... but I'd say a waitlister would get a 50% shot at receiving an interview.
Good luck to all of us tomorrow afternoon!