Original design on the bottom, obviously. Looks like we're getting traditional analog sticks instead of the circle pads Nintendo showed off last year. The Start and Select buttons have been moved, and both sticks seem to have been moved outward. Not sure how comfortable this looks, but analog sticks are a good thing.
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http://i43.tinypic.com/25z1non.jpg
Watch and you'll see... someday I'll be... part of your world!