FWIW, as of two weeks ago, my closest store was still signed GameStop with no sign of work on changing the name, but a couple of days later was already renamed in OSM.
In fairness to @wolfy1339 , the rebranding announcement webpage which CjMalone linked to earlier at “www.gamestop.ca” is now redirected to ebgames.ca. If you go to https://www.gamestop.com/INTL/choose_site_ca.html you’ll be prompted to pick a link to either the American or Canadian site, and the Canadian links to gamestop.ca are redirected to ebgames.ca. In this respect they’re already d/b/a EB Games again, even if the storefronts haven’t been updated.
Likewise I was in Chinook Centre in Calgary last week, and the location there is still a GameStop. Frankly I have no idea if any of them have changed physical signage yet.
I only took notice of the change two weeks ago, but I still haven’t seen whether the local GameStop at Spruce Grove have flipped back to EB Games, so do the locations in Edmonton and area.