Grand opening has been announced for March 31, 2017, at 7:00 am. http://www.costcobusinesscentre.ca/

Article on the Star website today: https://www.thestar.com/business/2016/12/14/costco-to-launch-new-store-format-in-gta.html Funny how they don't say where in Scarborough, but based on this thread I would assume they will take over the old Zellers building at Warden/Eglinton...