What would the rumor mill do without the overseas "black" and "grey" markets? They seem to be the place to find leaked Apple products and prototypes that may otherwise have been lost in the abyss. The latest find seems to be an iPhone 4 prototype with a reported 64GB hard drive on board.
According to Unwire.hk, this unconfirmed Apple iPhone 64GB model can be purchased from Sin Tak, the largest grey market in Hong Kong. The sellers claim these are actual engineered models, and available in small quantity.