It’s far from the first time that Apple has filed patents for some kind of tablet computer. It’s been described in the past as a large iPhone, or as a full tablet, but these latest images look like a large mobile internet device that would be pretty neat. Most of the 52-page filing is in regards to the touchpad.
The device would be large enough to read easily and use, but also thin and light. One of the images has an interesting virtual keyboard. Some of the illustrations show a tablet Mac with a full windowing interface, where interface windows can be enlarged, shrunk, moved, and cycled, rather than being locked in place like the iPhone. Click the link for an interesting read on more details.