I just spoke with the Canadian export manager from Polk. He said the headsets are set to arrive in Canada on March 5th and should be to various company warehouses by mid month.
He suggested that Bestbuy and Futureshop would be the first to have them.
So if you pre-order from Bestbuy.ca or Futureshop.ca you should get them around the 15th some time.
FYI they are only $149.99 in both those stores while $159.99 and higher elsewhere