I have to say I find the information on the INZ website very confusing. In places it states that, if your husband applies for a WP you and the children can be included in his application. Then, in other places, it says you need to make a separate application 'according to your needs'. So much information is out of date in the Operations' Manual that it's difficult to pick your way through it.
I would hope that, if your husband applies for a WP, it would then become clear whether you can be included in his application or if you need to apply on your own behalf. If your husband gets his WP before you all leave for NZ your visa could probably be sorted as well, but if he's going to apply when he's already in NZ then you would all need to enter the country on Visitor's Visas.
If he has a WP, any application for PR can run alongside it so that's not a problem. The WP is just a means to tide you over until your PR application is processed.
I'm sorry that's not more helpful. Let's hope bumping this thread up will prompt those who have taken this route to provide an answer.
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Mother Bear 
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