The act provides for numerous discretionary exemptions. When it is a matter of disclosing information, there are many discretionary exemptions. It must be determined if the information should be disclosed or not. That depends on the circumstances at the time the access request is made. It must however be underlined that the act clearly states that there is a presumption in favour of disclosure. President Obama did the same thing with his order. That is provided for in our legislation.
On April 29th, 2010. See this statement in context.