A BAT spokeswoman insisted that the taste of their products would not change. It's safe to assume that the toxicity won't change, either.
Story from the Globe and Mail: Imperial Tobacco plants to shut down (sorry, fee required). No mention of BAT's until-recently-secret manufacturing facility in North Korea.
Rothmans and JTI-Macdonald still manufacture cigarettes in Canada.
Response from Physicians for a Smoke-Free Canada: Imperial Tobacco's closure of tobacco plants is an opportunity to say "good buy".