Singapore Airlines?
London Heathrow was to continue having a double daily 471-seat A380 operation, but it has been reduced to daily from February 1 to March 29. The daytime Europe-bound service will now be on the 264-seat 777-300ER, meaning 43% fewer seats per take-off, but the overnight service to the UK will still be on the A380.
Sydney A380 flights have fallen from double daily to daily in May. The 20:20 departure from Changi (SQ221) and the 11:00 take-off from New South Wales (SQ232; not SQ222) will be on the 777-300ER.
Tokyo Narita was to see the A380 on March 30, but this has been pushed back to May 1. It'll leave Changi at 23:55 (SQ638) and arrive back home at 17:20 (SQ637). The 777-300ER will be flown in the intervening period.