There is a specific transitional rule in these provisions. The intent is that once this legislation is passed there is a bit of a delay. That provides time for new regulations because there are complementary regulations that will be needed for this particular new regime. That provides some time for the CRA to announce those, to distribute, and to get those regulations passed. The intent is to provide until April 2011 for the full implementation of this new stamping regime, so to provide the transitional period.
On April 22nd, 2010. See this statement in context.