From what I was told, your application goes into committee review about 3-4 weeks after your interview and that is where they make the choice to reject, accept, or keep it as a maybe until further review. The further review may very well develop into a waitlist thing. As far as pre-match is concerned, they give out a huge chunk of the spots a few days after pre-match. They then give out spots a few times before january. Then after that the class spots have been given out and the waitlist period really begins.
So does this mean if we interviewed a couple of months ago with no rejection so far, our chances of acceptance increase?