In Nav Canada AIC 2/18, it was announced that the Canadian ADIZ will expand, reaching further north to include most of the Arctic Archipelago. The expansion will occur on May 24th, at 0901UTC. See the expanded area here:
Requirements for operations in the ADIZ remain the same. You’ll need a transponder with altitude reporting and a working two-way radio. Remember, you’ll need to include the time and location of ADIZ border crossing in your flight plans RMK section.
Full AIC 2/18 for the detailed lat/long of the expanded area here.