If there is not enough 3 year F/O's then they go to the guys how meet the accellerated numbers (18 months), then internal DEC's and then new hire DEC . Looks like about 30 Dec's on the 777 in 2008 and AirBus upgrades might be down to 3 years early 2009. The number of AB Capt's going over to the 777 is down from the first plan, I guess we need them on the Bus, rumour has it that the 380 might be coming a few months early.
Ask them in the interveiw what the upgrade plan would be for you, they should have an answer for you .