As to the OP's original question, the answer is NO, for what I consider to be an obvious reason: Pottermore has no business interest whatsoever in pushing Amazon to abandon MOBI and adopting EPUB, so they won't.
AS to DRM, my understanding is that Pottermore is opting for a social DRM scheme, in which the buyer's credit card number would be digitally watermarked unto each copy sold. Will that work to protect Ms. Rowling's IP rights as well as regular DRM? Color me skeptical, but we will find out in a few months.
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