CX has a different approach than airlines like SQ or QF, where they actually need aircrafts with longer range and/or higher capcity (ie, sydney to london, singapore to new york)... CX would rather have an extra flight, more flexible schedule, (ie, 4 flights daily to heathrow, they would rather operate 2 A340-300, 1 at 0900, 1 at 1430 than 1 A380 just once)
so what i'm saying is that A380 will not be in their plan.