The one thing that I think everyone on this thread keeps missing is the fact that they accept in terms of descending stats order. So the interview date is not nearly as relevant as your stats. It is not true that everyone who interviews has the same chance at acceptance (the interview is just one of the many data points they are collecting for when the whole committee reviews your specific file and makes a decision).
The higher your stats, regardless of the interview date, is the descending order of priority given when they offer acceptances. This is much more important than the OOS and IS confusion that persists on this thread. To reiterate what someone else already said and clarify that ongoing confusion:
They did clearly state since I wrote it down right when they said it, in response to this exact question, "When will we receive our decision?" (This was an interview date in October). Their response was clear, and I quote: "IS will hear back in December, OOS will hear back "around" Thanksgiving."
This may be true as evidenced by a few OOS applicants who posted on here that they heard by Thanksgiving (but look at their stats, they were sky high (Lizzy M 75 or so). Those who are OOS who heard back around Thanksgiving were those with very high stats since that is the highest priority for this or any other school. For everyone else with slightly lower stats, just have to be patient and wait for your files to come up for review by the ADCOM.
PS: If someone more recently was told that they would hear between January-April, that is still consistent with the claim above, since those who will hear back in January (who interviewed this fall) will be those with (you guessed it), the higher stats, and descending on down the list until those in April who hear back will be those with the lowest stats. Ultimately, their numbers will most likely stay consistent from last year, since that has been the trend for the last several years, so if you're within that range of current matriculants, your chances are good, if not now, at most by the end of the cycle in April.
Good luck to everyone applying!