I am not sure if this information will help you out or not. On Dec. 16, I received an email from the MSTP office offering me an interview for Jan. 12-14, which will include my MD and MSTP interviews. I was complete with my secondary on shortly after Thanksgiving (so late Nov./early Dec.). If you have any other questions, feel free to PM me.
Best of luck! Hope you still get a MSTP interview.
I talked to the MSTP office today. I am currently on hold for an interview with the MSTP. They suggested that I schedule my interview for sometime in Feb. and if I get an MSTP interveiw, they will change my MD interview to that date.