Thanks Brian,
Just checked my flight's departure status on the AC website, and it actually does show "F63" unless that was an error. Hope the main signage has also been changed to reflect the different piers, as there's also U.S. departures from the non-jetway gates up to 262, along that 27 mile walk to the gate.
Mainline aircraft, so I hope it's actually gate F163.
bj-21.