I think we're probably likely to see another rotation on an A330/77L
A330s are being retired and are mainly restricted to dead of night runs around Asia due to older hard product and dated premium cabins, and the B77Ls are very few in number with the small subfleet of B772s going soon. Poor analogy but EK have gone down the Ryanair route of having a
pretty large smallest aircraft.
Hence getting to a twice daily B77W *may* be challenging and dependent on how much of a bloodbath we see at EDI with Qatar vs Etihad going after the same market as that would reach into NCL's catchment area.
Any overflow cargo can easily be trucked to GLA or BHX rather than have a less than full B77W sent to NCL.