Cathay Pacific Airways plans to phase out 23 747-400s beginning in 2013 in an effort to realize fuel savings of 22% per seat. COO John Slosar told Hong Kong media that the carrier is considering a variety of replacement aircraft and that "the A380 is also an option."
quoted from another thread on pprune.
the a340-300 is pretty efficient in the crz, so i suspect in these fuel crazy days that cx will keep hold of them for a little while. the a340-600 strangley seems to have been an experiment for the polar route and therefore a forerunner for the 777ER currently plying the HKG-JFK route. read into this what you will.
regards,
N1 Vibes