Hi! I talked about the curriculum changes in the previous comment, basically you won't be taking classes with the medical students it will just be with your BMS cohort, but you can be assured that they will still challenge you and make them as difficult as medical school courses, and the basic premise of the program won't change! Do well in your classes and the interview and you'll have a great shot at getting in! One thing I think people get confused about is they think you're competing against your classmates for a seat in CMS, which isn't true. Theoretically, 100% of the class could matriculate and they told us that, however the two main reasons of not getting in is getting a C or underperforming on the interview.
For the timeline, there is no criteria for getting an interview other than being currently enrolled in the program. You could have gotten a C in your first two classes and you'd still have a chance to interview, but your likelihood of being accepted to CMS would be low but they interview you anyway because it's guarenteed. The two classes that you will have grades from before the interview are Clinical Molecular Cell Biology (CMCB) which ends at the end of fall quarter so it just ended on a Friday for us and Medical Biochemistry, which ends 3 weeks later. Generally, interview invites begin in mid to late January to February and you should find out if you got conditionally accepted within a week. A conditional acceptance means your matriculation is contingent upon you maintaining B's or higher in the rest of your courses and maintaining professionalism, integrity, etc.
For mentors, you are assigned a mentor at the beginning of the year. It will be either Dr. Weiand, the director of the BMS program, Dr. Pomarico, a professor, Dr. Sukowski, or one other. For student mentors, during orientation week we were in groups of 6-7 students who had an Orientations Advisor who had been through BMS the previous year. Our OA still keeps in contact with us and is readily available to answer any questions or concerns we have throughout the year.
For Health Administration, I unfortunately do not know as much about it since I am in the Nutrition track. If anyone has questions about that track let me know! Basically for each track there are 4 classes; you take 1 during fall quarter, 2 during winter quarter and 1 during spring quarter. My friends have told me that for the fall quarter class for health admin they have weekly discussion posts based on weekly readings where you also comment on other people's posts and 5 papers, 3 short 2 page double spaced ones and 2 longer 4-6 page papers. All classes have the same basic set up with discussion posts and are generally easier than the medical classes. For my first nutrition class, we had one short double spaced paper and weekly online quizzes based on the readings!
I hope that helps! If there's anything else or something you need clarified let me know
Good luck!