"Already using Netflix?
So the question is, what about all of those Kiwis who have already signed up for Netflix, either through a DNS service or Slingshot’s Global Mode? Well, when you sign up for a Netflix account your account is “global”, meaning that if you have a New Zealand account, but happen to sign into Netflix while you’re in the US, then you’ll get access to everything in the US and vice versa (which may be a rude shock for American users travelling here).
So New Zealand users with American Netflix accounts have nothing to fear in that regard. But if Netflix has its way, the discrepancy between what is offered in different countries will fade away. The plan is to merge everything into a global catalogue, removing differential distribution and release dates."