Read on reddit that YYZ is going 5x weekly from 3x weekly, and found this article
https://www.aeroroutes.com/eng/250418-qrns25yyz
Qatar Airways from June 2025 plans to expand service to Canada, as the airline schedules 5 weekly Doha – Toronto flights from 19JUN25, instead of 3 weekly. Service will further expand to daily from 26OCT25.
This route is operated by Boeing 777-300ER aircraft.
QR767 DOH0810 – 1500YYZ 77W x12
QR768 YYZ2100 – 1640+1DOH 77W x12
Good news for me, managed to move back my April 2026 YYZ-DOH-HKG flight by a single day, and avoided overnight layover in both DOH and HKG - saved $5 in fees too, the online engine to change award booking went surprisingly smooth