HBS announced the following on the admissions blog:

"We will be sending out interview invitations on the following three days: October 4, 6, and 12. Try not to read into which date you hear from us—being invited to interview on October 4 vs. October 12 does not mean you are more likely to be accepted. We spread out interview invitations to avoid congestion on the interview sign-up pages.

If you haven’t heard from us on October 4 or 6, you will hear one of three things from us on October 12: 1) Invitation to Interview 2) "Release" or 3) "Further Consideration." Let me explain. By "releasing" those of you who will not move forward with our process on October 12—rather than waiting until December to let you know—we hope to give you time to explore other potential options. For group 3), we would like to "Further Consider" your applications in Round Two.

Interviews will occur between October 23 and November 18. In addition to on-campus interviews, we also conduct interviews in Shanghai, Tokyo, Dubai, Mumbai, São Paulo, New York City, Palo Alto, London, and Paris. Where you interview does NOT affect your likelihood to be accepted (all interviews globally are conducted only by members of the Admissions Board), but if you come to Boston to interview, you’ll also have the chance to sit in on a class and interact with current students and faculty. Candidates who are not able to travel may be accommodated via Skype."