Hey, I haven't heard back from UBC MPH regarding acceptance/rejection yet.
Obviously I'm sure each school's process is a bit different, but I have a feeling hearing later might mean you're a second or third round pick or higher up on the waitlist and they're waiting to see how all the spots are filling up with the applicants they've already sent acceptance letters to. They don't want to have to send out too many emails and increase the work load for their administrative staff. Just a thought! Good luck!