Apple Developing 10", 13", and 15" iTablets?

While most recent rumors have been swirling around Apple developing a 10" iTablet that would basically look like an oversized iPod touch, Gizmodo has a source, said to have been 100% reliable in the past, who's telling them Apple is also planning 13" and 15" tablets, one of which... will run Mac OS X.
This source claims that the two touchscreen prototypes—made of aluminum, but on the shape of big iPhones—were in a factory in Shenzuen, China. One of them "was running Mac OS X 10.5." When I asked, the source didn't know if these were built for demonstration purposes, or if they were preproduction units. The company has a tight relation with Apple but "it's not FoxConn."
Could Apple be making both small, iPhone-like tablets and larger, MacBook-like tablets? Do we want them to?
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Rene Ritchie is one of the most respected Apple analysts in the business, reaching a combined audience of over 40 million readers a month. His YouTube channel, Vector, has over 90 thousand subscribers and 14 million views and his podcasts, including Debug, have been downloaded over 20 million times. He also regularly co-hosts MacBreak Weekly for the TWiT network and co-hosted CES Live! and Talk Mobile. Based in Montreal, Rene is a former director of product marketing, web developer, and graphic designer. He's authored several books and appeared on numerous television and radio segments to discuss Apple and the technology industry. When not working, he likes to cook, grapple, and spend time with his friends and family.