Honestly it is a mystery to me how this fleet allocation goes.
It seems that last year the 787 was pretty exciting and there were lots of transfers from the airbus fleet. As of late I believe most people on the airbus have decided to wait and hopefully get the 350/380 so now they are putting new hires on the 787.
I think if it benefits the company then anything is possible, and with the new arrival 2 new types this year alone, nothing would surprise me.
I heard some cabin crew say they were already scheduled to start training on a380 in March. Still no firm date when the aircraft will enter service, but I believe we have 2 airframes ready.....
The 350 is scheduled for December? But Mr. Baker was quoted as sayin it may be ready early like Oct/ Nov.