Hey! I've been looking to see if I could find a more recent thread discussing this program as well but was not successful in doing so. I suppose we might as well pave the way lol
I spoke to someone at the office regarding the requirements and was told the matriculation requirements were a B or better in 3 med school level classes, a letter from the committee and an interview with the medical school. I've also spoken to a former PMP student and was told if you're not able to meet the B requirement at first, they're good about giving you another chance (retaking the class, if I recall correctly).
In terms of admission, I'm not sure if it's officially rolling because the office says they won't be getting back to applicants until after June 1st. But I was told by an alumni that the earlier you submit, the better so maybe it'll just matter in terms of how soon you hear back AFTER June 1st. But applying earlier than later can't hurt.
Hope that helped!