Virgin Blue has 3 new aircraft types coming: Embraer 170, Embraer 190 and Boeing 777-300ER. The B773ER operation is yet to be announced re crewing/routes/name etc. At this stage the Embraers are set to be crewed by existing cabin crew, however routes have not been announced - although its likely they will be used for both new routes, and also capacity management on existing routes.