Per a number of independent college counselor listservs/communiques, Harvard has evidently offered a number (no one knows how many) of waitlisted students (current freshman elsewhere) admission for spring 2020. This info comes from highly reputable industry participants, some of whom directly advise students who received these offers. I have not heard of this offer going to previously rejected students.
This would be another change in the landscape post-NACAC ethics rule changes which previously disallowed ‘cold-call’ recruiting of transfer students.