My guess would be Virgin selling the 787 options (and making money from it!) then being one of the first customers for the A350 which won't (famous last words) be that far behind time wise. It would save on training and probably with some other deal to relieve us of the A333s that will become surplus.
No inside info, as I said just a hunch.
Mind you, who knows what will happen when we eventually get taken over by....well, take your pick!