Rebecca,
At my school we have new quizzes enabled as an option but do not encourage anyone to use them yet unless they are experimenting. It's functional, but there are still some key feature missing.
Regarding IP address filtering, this is something that is available on both New and Classic quizzes but it's not going to do what you are asking about. It allows you to lock down a quiz to only work specific computer addresses, or a range of addresses. So for instance if you have a computer lab and knew all of the IP addresses of the computers or range of them, you could lock down the quiz so that it would only work on those computers. So not really any sort of use case for remote situations.
Rick
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