Had a word with AdCom, the status would be released by 15th May on rolling basis.
However, IMO, ISB will roll out the admits for R3 on 25th April and will then start with waitlisted applicants. Because if I remember clearly, R3 was declared post the R1 decisions were rolled out on 20th Dec. And the date communicated to us was more in line with the application cycle that ISB had decided before opening up R3.
On the number of admits that the candidates have accepted and the number of seats vacant, the AdCom member said she cannot disclose any information.