For NZ to meet Aussie in the final, then isn't one of the teams gonna have to finish runner up in their pool?!? I can't see the likes of Argentina, Wales, Ireland, or Scotland winning their respective pools.
Therefore the semis are more than likely gonna be:
NZ vs Aussie
Eng vs France
I'd go for a NZ vs Eng or France in the final myself (with NZ winning of course

).