The current CVF plan is for around 60,000 tons, fitted for but not with, an electro-magnetic catapult system. Aircraft will be STOVL JSF. Bringback is definately an issue, but is still way way better than GR7/9. The main layout for of the carrier is already finalised. The problem with changing the variant of aircraft is an automatic 3 year delay in the programme, with associated costs.