my guess is it will be implemented in the trusted traveller security lane. Which allows GE pax who have their card to show, AFAIK.

Unlike TSA pre - where airlines send pax info. To TSA, and are then cleared (or not ) and noted on BO to get trusted traveler security access, in Canada, you must have your TT card to get access to that lane. I suspect those who have and carry a GE card will have access, and GE pax who don’t (as it typically isn’t…or isn’t supposed to be…required to use entering the US at US airports) will not.