Well this thread is now useless as Derek Perez has flatly denied that NV30 was redesigned at the last minute to add extra pipelines. Who do you believe more: a website that needs hits to get ad money to stay in business or a company employee who can get sued and lose everything they own plus the company lots of moeny for telling false statements to the press? That's right, the SEC would look very unkindly on Derek Perez for telling lies. My money is on Derek's quote.
However, the nvmax blurb about this mentions multiple models. Hmm, is the mysterious NV28 actually an NV30 with fewer pixel pipelines? Guess we will just have to wait and see.