If you look at last years forum posts, the consensus regarding Columbia's slideroom was that when it changes from say "2015 Painting" to "2015 Painting MFA" it means that your work is being looked at. But when it changes back from "2015 Painting MFA" to "2015 Painting" then you can assume rejection. But this was only seen with Columbia's applications.
Also, this is only based on a few peoples applications so it could very well be a myth. As of now, mine has changed to 2015 Painting MFA. I'll update on what slideroom says when I find out if I got in or not.