It isn't an Apple product, but it appears to have Apple's semi-blessing from what I can tell so far...
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"Other World Computing (OWC) and Axiotron on Thursday announced plans to unveil a Mac-based tablet computer they’re calling the ModBook. It will debut at next week’s Macworld Conference & Expo in San Francisco, Calif.
The ModBook is described as "a high-end slate-style notebook computer," designed in California by Axiotron and available in the U.S. exclusively through OWC. Pricing was not announced.
The ModBook is, at its core, a laptop Macintosh that’s been modified. It features Wacom "Penabled" hardware for stylus input and is compatible with Inkwell, the Mac OS X v10.4 "Tiger" pen input technology that provides system-level handwriting and gesture recognition to Mac applications.
The ModBook will also feature optional Global Positioning System (GPS) capabilities, built-in iSight camera and CD/DVD combo drive. OWC describes the chassis as “aircraft-grad magnesium alloy."
http://eshop.macsales.com/shop/ModBook.