Hopefully F-35B (shame the carriers aren't big enough for the F-35C) will be rather more cutting edge than the Harrier now is.
Looking back at past info (mainly Hansard) on the CVF they are perfectly big enough for the F-35C (Hoon et al stated they must be capable - ie big enough - for both conventional and VStol), the ships just need the cat and trap - space all designed in to take such kit.