thanks a lot for explanation :-) It will help me with decision, when to fly. If I decide to fly before May, I might add 20k additional qmiles (promo regarding flights to AKL). Together with 5x qmiles which are offered today only, it would give me huge amount of qmiles (I haven't found any provision stating that these two offers can't be combined).
I have one more question regarding this matter. What do think about this seat from the perspective of such a long flight (one of the longest, isn't)? Is this comfortable enough to survive such flight?