Yes, upguage on this route started today and will last until 01SEP.
(Going by memory here) The 767 will be on 155 on YUL-YYC on Thu-Mon. Some days on weekends will have 2 767s going westbound.
For Eastbound, only the morning flight on Sat & Sun will be 767.
The extra 767 turns around and go to YYZ.