Cyril, I agree with you. During my GD, I asked the lady HR about this.
She told me that this time they would be calling for 3 days. Day 1 would be interview. If successful, day 2 will be IPT.
3rd day is kept as a buffer. Medical date would be advised in due course.
as the GDs will start in Feb for the older batches, the picture will be clear.