They PLANNED to use the B 747-400 to fly on this route but everything was put on hold.
I doubt the B 767-300ERs have the range to fly from HKG to LHR.
I would say its likely that they will deploy the B 747-400.
I heard that HKG-AKL is quite full on certain days of the week, especially during peak season. Possible to upgrade a few flights from B 763s to B 744s?
Air New Zealand flew their B 747-200s into HKG before.