There's been more speculation this week concerning the NX. The Wall Street Journal, however, had an interesting bit of information about "industry leading chips" in their article about the speculation. NintenGen emailed the author of the article, Takashi Mochizuki, and got the following response:
Several people who said who have seen a demo said what they saw is impossible to run on a computer without a "industry-leading" or "cutting-edge" chips. Cutting-edge in what way, they refused to elaborate.And an important thing to remember, probably you know well already, is that chip specs won't be finalized until much closer date to the release.