So far as pilots are concerned, this is all irrelevent until the next round of contract negotiations.
Yes, all Air NZ and Freedom A320 pilots are now part of ZEAL, but the Air NZ pilot contract has not changed significantly, neither has the Freedom one (the vote mentioned went ahead and the contract variations were approved by both pilot groups) Freedom pilot numbers are capped at their present levels, so there is no threat to Air Nz pilots that they will be replaced.
2008 is when the contracts are due to be re-negotiated, and at that time I would be surprised if there is not one common contract for all A320 pilots in the Air NZ group. The interesting thing will be whether this contract is closer to the current Air NZ one, or the current Freedom one. I suspect it will favour the Air NZ contract, as the Freedom troops are feeling a bit like the poor cousins doing the exact same work for less money and (very slightly) poorer conditions. Not that they are complaining too much - it is no longer the piss-poor contract job it was 3 or 4 years ago.