"it would not be exactly the first time that Intels designs contain some pieces that are not intended for immediate use"
True. But unlike Willamette, there aren't any mysterious areas on the Prescott die. Pretty much every area can be accounted for, and the things Hans take as evidence of 64 bit capability have other, alternate and just as likely (if not more likely) explanations. Now this is not to say that some more flexible way to address more than 4 gig. of RAM isn't on Prescott, it needs that more than 64 bit instructions any way. But if they expect to have software support for that anytime soon, they can't keep it secret...
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