This year is unusual because of the circumstances after Hurricane Sandy. From previous years, it looks like NYU SOM has a large wave of acceptances on a certain day after interviews are over. This was December 15th in previous years (they usually end interviews in early December). However, since they are still interviewing applicants until January 25th, I'd imagine this date will be closer to the end of January (Since they still have on their website that applicants will be notified prior to February 1st - Keep in mind that I also remember that another website said it was pushed back to March 1st so it could be even later).
As with previous years, NYU did accept a small group of people before this date. I think we all just have to wait until their interview season is over.