Some quick math:
~400 students per class. Say half the spots are taken in rd 1. That's 200 spots.
57% yield. So they accept ~350 to enroll 200.
~75% of interviewees get offers. So they interview ~450 to admit ~350 just in rd 1.
Apologies if there are any holes in my logic. My brain is on Friday mode after my office's holiday party last night.
I have only heard of 2 invites. I think the vast majority must still be coming . I have no theory regarding the big gap between the 2 that have been reported and the present.
Also on the scheduling website, there seem to be a ton of dates and times available which would mean that they are not yet taken!
This is just my opinion and could be 100% wrong, but hopefully it will provide hope to those who have heard nothing.