It is in Sydney route , then follow by Delhi in August n finally will be on Mumbai route from Sept

it won’t be on JFK route as it need 3 aircraft to run this rotation. So SQ will be facing headache if it put the only refitted aircraft on JFK. Because the number of seats are different. So if SQ deploy on JFK route. Then the pattern will be Monday (new plane) Tuesday/wed (old plane) Thursday (new plane) Friday/sat (old plane), Sunday (new plane), Monday/Tuesday (old plane). Every week everyday different configuration.
So SQ will be creating trouble for themselves. How they are going to sell the seats ? Some days sell 6 first class some day sell 12 first class seats. Same go for the economy seats. (200+ vs 343 seats) ? SQ want consistency n less headache.

Further if SQ put one plane on JFK, then later on pax will also complain why they are getting the old plane instead of the refitted one.

Pls do understand that JFK is a long route n 3 different A380 to run it. JFK will be the last route to get the refitted A380 (until SQ almost refitted all its A380).