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As a side note, while the Zelda demo ran on hardware in real-time on the show flow I think it is highly unlikely that the hardware it was displayed on was representative of what the released hardware will be ...

About 6 months before it was released XBox 360 software was being displayed on hardware that only had a 2 core CPU that didn't have the additional instructions set that was part of the XBox 360's CPU, the GPU wasn't the same one that was released in the system (I don't remember the specifics though), and was packaged in a large PC tower to keep heat under control; and even then there were many instances of these demo systems over-heating and displaying errors.

12 to 18 months before the Wii U is being released, with hardware that is far from finalized, the Wii U software was running on unspecified hardware that was packaged into a case that is tiny and represents the size of the final Wii U system. Nintendo was very careful to say that none of the software on display was products and that they were demonstrations of how the controller could be used, third party publishers were not allowed to demonstrate software on the show floor, and there was a much more advanced demo that was shown behind closed doors only.