Here is what I'm inferring based on the recent updates on the forums:
A select portion of the 3/14 interviewees were accepted last Friday along with a few people pulled from the alternate/hold list from past months. No one has been rejected yet, and no one who hasn't been accepted from the 3/14 interview has heard anything (including myself).
This means that Western does not want to send double letters, e.g. one for the waitlist for the 3/14ers and another one to accept some 3/14ers a few days later as spots are left unfilled. So, they are trying to maximize their information to accept the most number of people from this interview slot and come up with a final waiting list. Imagine how funny it would be if they had to pull 10-15 people off the waitlist a few days after sending them a letter.
With that in mind, the school has specifically said to a few callers that not all the acceptances have been mailed out yet. This scenario holds perfectly in this case, and we will probably recieve all information Friday or Monday. Until then, all we can do is wait.