mmmbop
Normally fleet numbers reduce over a period of time and crew members start bidding off the fleet. Management massage the movement within the 12 month training period by allocating priority positions on other fleets to crew members of fleets where there is an excess (no bypass involved when it's within the training period). There would normally be very few crew members who would be left in a position where they would have to be assigned to a lower type.
SkyScanner
QF won't be getting Triplers that are 1990's technology, therefore I doubt that we will be getting them next year (are your sources reliable?). Deliveries starting 2012 is my understanding and they will be the "Series 2" version with a lot of B787 technology included - longer range, lower fuel burn, lower seat/km costs, common flight deck, etc. The only way that QF would take early delivery of Triplers would be if they were short term leases with the aircraft being replaced by the "Series 2" when they are available.