Call me skeptical, but it's sad to see how hard the stock market responds to online buzz of a product not yet in stores and not yet available without even knowing whether Nintendo will receive any long-term value from it. The current price is being driven purely on speculation, bang for buck bubble expansion. As soon as any "real world" effect is revealed regarding the value of Nintendo, market price will adjust accordingly.
People aren't interested in investing in Nintendo, they just want short term profit.