In this industry I am usually reluctant to say "never!", however, I think I am safe to say it on this occasion.
Air New Zealand have talked very loudly about the efficiencies in reducing 5 mainline pilot groups ( 737/747/767/777/A320) to just two ( A320 and a combined 777/787 group).
I cannot think of any advantage the 747-8 would bring to the NZ fleet ( other than "it looks nice" , which doesn't translate into $$$$$). Don't hold your breath waiting to see another quad in the NZ fleet, in my opinion.