C-GITU 451 is now also showing up for AC460 YYZ-YOW tomorrow (Oct 21), with the new seat map, basically identical to the old one but with a row 42 added and a reconfigured galley/lavatory arrangement. The lavatory forward of the 3R door is still there.
EDIT: Seems like the first flight switched to AC692 YYZ-YYT.