I suspect the plan is Columbus crew on A319/320/321, A380 and B777 a.s.a.p., hence only 3 types. The 380 will be getting all the big box payment routes (HKG/SIN/BKK), the B777 can also cover some of the additional lucrative routes (eg NRT) if it makes a difference to the bottom line over operating a 747. The 787 (if it ever arrives!) is largely a 767/777 replacement so could be crewed by existing crew. The 787 could eventually be recrewed as numbers build. Eurofleet would probably see a more rapid change as I suspect there'd be quite a few volunteers amongst existing crew and all new entrant positions would be backfilled either by LGW crew or new entrants on the Columbus contract.