Here is the Aviation report on it;
UPDATE TSB #A16P0204: C-GRSL, a Beech C90 (King Air) aircraft operated by Canadian Flight Centre, was en route from Vancouver/Boundary Bay, BC (CZBB) to Edmonton Intl, AB (CYEG) under IFR at FL210. Approximately 40 nautical miles North West of Revelstoke, BC, the aircraft began to lose pressurization and the flight crew requested a descent to FL190. Subsequently, the crew reported a pressurization failure and declared an emergency. ATC cleared the flight to the minimum IFR altitude of 14 300 feet ASL and the flight continued to its destination. The TSB is awaiting more information.