I just asked the admissions officer whether they are still releasing the interview invitations. I was told that the school will continue releasing the invitations right up to the deadline, early April. So do not give up yet!!
I just received my interview invitation today. So it is confirmed that the school is still in the process of releasing the invitations. I am thinking of scheduling the on-campus interview on Aprial 2nd. But not sure if it is too late since the decision deadline for round 2 is April 5th. Anobody who can advise? Thanks lot and good luck with everybody! Your invitation will come soon!