Last time i spoke to the program coordinator she said that interview invites would come on a rolling basis until March (I don't know if it's early march, mid-march or late march).
She said that the way it works is that each prof gets a pile of applicants interested in working with them and from there it's basically up to the POI as to who, when and how they will contact applicants. I'm guessing that some may prefer to rank their favorites and go down the list until they find a match, others may choose to contact 3 or 4 right off the bat. Maybe some do it sooner, others take their time.... hard to say.
I think that way is even worse than most for us here on the waiting side.... We also gotta keep in mind that apparently they had something like 500 applications. Even if they cut 50% due to GRE, interests, GPA, etc (like they were discussing in another thread), we are still talking about 250 applicants, which is more than most programs get in total. That is really really competitive!!!!!!!
Good luck to everyone who already interviewed there!!!!