I haven't said it for a while, but I apologise to those who know what's coming.
The first rule of flying with QR - PICK THE TIMINGS AND PRICE YOU WANT, OVER THE AIRCRAFT TYPE.
As has been pointed out in the thread, the A350 has been heavily delayed in its deliveries to all airlines (not just QR).
As such, the swaps on A350 routes have been regular.
Before the question is posed, please note that QR will not refund or exchange your ticket, purely because the aircraft layout has changed - nor would they if the airframe changed (with the exception of A380 routes in F).
M