HBS posted the following update on their admissions blog:

"A few Round 2 items to update you on:

• Interview invitations will go out in two waves: January 25 and Feb 1. As before, try not to worry about which day you receive an invitation to interview. It’s an administrative step for us to make sure everything goes smoothly with the interview invitations and sign-ups. Interviews will be held from February 3 – March 6. 

• In addition to on-campus interviews in Boston, we will be interviewing in Dubai, London, Menlo Park, New Delhi, New York, Paris, Shanghai, and Tokyo. No matter where you interview, a member of the Admissions Board will conduct your interview and the process and evaluation will be the same. If you do decide to come to campus to interview, you’ll also have a chance (if you want) to sit in on a class, meet fellow applicants, current students and faculty members."