I've heard "nyoo" only from old people who have studied diction in the past and are now radio and TV "nyooz" announcers. I agree that there are regional differences, but they seem to be getting filtered out as the world grows smaller. After growing up in "Noo Hampshah" I visited my parents in western Pennsylvania in the 60's, and we went to church.
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Anonymous"New" sounds like "noo" in the Northeast.As well it should!