Still waiting on UBC yes. Spent the entire weekend going over my application - I think I read my LOI upwards of 20 times, as if it makes any kind of sense or difference to the situation. Surely UBC will send out notices this week. Surely!
It sounds like you came back super focused - Best of luck to you this time around! For the MPH, it says "Letters start to go out in March and can still be going out until May." MAY!! And no supervisor needed for the MPH since it is practicum-based. Students are matched with Advisors instead who help with course selections and practicum placements.
I applied for the MPH program. The FAQs page says that for the MSc emails go out February or March. Hopefully they stick to that for your sake - April is eons away! (I'm really not helping am I?) Did you apply for the MSc last year as well?