Virgin is gonig to 11 weekly from April next year (daily A330s, 4 weekly 747s). Not a lot of scope I believe to start double daily to Orlando as well as operating the Barbados and Las Vegas services given the fleet size (this also applies to any potential routes they're contemplating).
Elsewhere, it is reported that SQ is attracting F class passengers on the SIN-MAN-SIN (whch is really good to see) but this expansion is more to with cargo and will be even more interesting if one believes what will happen to this route in the medium term. Remember that A380s aren't the best aircraft to have operating when you carry a fair amount of freight so whilst 2 A380s are operating out of LHR, they need some more cargo capacity which is why it's commecially useful to operate daily services again to MAN.