The leak was made on March 13, 2009.
In addition, copies of agendas, photos, speakers lists and other documentation are available. Also of note is the turn of events at the CBC. Wikileaks' source mentions and speculates the following:
After running a few times on CBC Radio One's early morning news cycle on March 20, 2009, the story was abruptly pulled. Thus, this tape has been released to Wikileaks, given the concern that this story was pulled or censored from within the Canadian Broadcasting Corporation.The CBC story mentions the use of front groups or clubs. Such clubs mentioned are: Star Trek Club, Star Wars Appreciation, Games and Leisure, and the Friedrich Nietzsche club at Carleton University in Ottawa. Such names hardly sound political, Tory, or aimed at attacking the Canadian Federation of Students. What's the big secret?