My understanding is that there have been some discussions with various stakeholders, including the Psychological Association, and colleagues at the Canada Revenue Agency. They intend to issue further guidelines based on some of those discussions, outlining specific circumstances and further details in terms of the application of this tax. They've had some general discussions outlining some of the general provisions and how things will apply, providing details and information to the stakeholders.
On May 28th, 2013. See this statement in context.