I got an expertflyer aircraft change notice yesterday on my flight QR 815 HKG-DOH on February 11, and verified from Qatar's website that the aircraft has indeed changed from an ex-77W to a non-Q-Suite Airbus A350-900. I manage to get 1K. My return flight QR 818 remains a CX 77W.
The aircraft change only affects QR 815/6 for now - QR 815 departs HKG at midnight, and QR 816 departs DOH at 8/9am.
QR 817/8 remains these ex-Cathay Pacific Boeing 777-300ERs with first class cabin.
Carfield