Sorry for the slow response, yesterday was my first day at DND.
There's no timeline. It depends on when the ACFO (FI union) reaches an agreement with the government.
Typically, the new cba's are agreed 3 years after the old one expires, which would be somewhere between 2016/17.
You can follow the union's collective bargaining updates here: http://www.acfo-acaf.com/category/colle ... argaining/