Noel Forgear (sp) has said on two occassions that Singapore Airlines Limtited will make the first flight. However as mentioned above, this is vague.
In addition, I see no interest in SIA of flying to LHR firstly becuase it is apparently going to put it on it's most profitable route, SIN - HKG - SFO.
Singapore Airlines could also do SIN - KUL just to get the first revenue flight departure and arrival.
In addition, I think it would be better of Airbus to make the A380 as quickly as possible and not wait until they have made 2 and then deliver them.
Anyone can fly, only the best Soar.