Air Canada appear to be swapping 3 of the Toronto flights for Vancouver next summer. As it stands, this is how LGW-Canada is looking next summer:
Air Canada Rouge
Toronto - 4 weekly 763
Vancouver (New!) - 3 weekly 763
Air Transat
Calgary - 3 weekly 332
Montreal - 3 weekly 313
Toronto - 10 weekly 333/332/313 (7x/2x/1x)
Vancouver - 7 weekly 332
Westjet
Calgary - 5 weekly 763
Edmonton - 2 weekly 763
Ottawa - 7 weekly 737 (via St John's)
St John's - 7 weekly 737
Toronto - 7 weekly 763
Vancouver - 6 weekly 763
Winnipeg - 1 weekly 763