Gizmodo has a pretty big one this morning. They claim that Apple is not only building the often talked about 10-inch tablet, but they are also developing much bigger tablets in 13 and 15-inch varieties. These tablets are clad in aluminum but in the shape of very large iPhones (gen 1?).
The machines were spotted in a factory in China (not Foxconn) and their source wasn't sure how far these were along. One could speculate that if they are in China they are being fitted for production. Their source said the company where they were spotted had a tight relationship with Apple. Quanta has been the rumored manufacturer of Apple touch screen tablet products for months.