Well, not sure how true this is. But what my Admissions consultant told me was that the on-location interviews that Kelley conducts (e.g. in Delhi, Mumbai, Bengaluru etc.) are usually for the MBA in MIS concentration, as that's the sole concentration that gets a lot of applications from India. For others, usually an invite comes, but only for a Skype interview.
In addition, I guess a lot of you must have gotten that email from Kelley that said, "
With respect to interviews, not all candidates will be invited to interview. For those who are invited, an invitation can come at any point in the review process up until shortly before decisions are released."
So let's keep hoping.

I know someone, from last year, who got an interview invite days after everyone had been interviewed. And he was the one who got admitted, finally! Hope that is the case this time too.