Well, the letters that we received did say that the official list will be established either in June or July.
Yesterday while finishing final processing, I was told that on paper, I am listed as provisional but that the official list will be released around mid July.
Being that everyone commenting here is still waiting for preemployment or the medical, it doesn't really matter since the list will have become official by the time class starts.
Even those who began in June, it won't matter much since not much time will have passed before the list was made official.