I really call that bypassing N.Z. not technically correct, just how I see it.
Although I am getting off in Auckland on the 09 Ring of Fire, rather than going onto Sydney so I am glad they are doing that. It is not what I would call a N.Z. cruise though.
The Mariner does the full 2 weeks Australia, NZ cruise that is what I hope they do in Spring of 2010, but it is unlikely.