The reclassification is a quasi fleet pay claim. Same rates for A380/744 and A330/767. It also means that the pay rate for any new aircraft is automatically set according to payload. I think the 787 would come in at the A330/767 rate but haven't seen the details.
The other important thing to remember is that these rates would be phased in over time in a schedule that hasn't been agreed to... so it is difficult to see how QF can make any claim on how much it will cost.
The other real important thing to remember is that the A380/A330 guys will only get the 2.5% p.a. The dying fleets, the 767 and the -400 will come up according to the schedule, but as those aircraft leave the fleet and the pilots move on to the Airbus aircraft then they will not get a pay rise for the promotion unless they can go 767 to the A380.