New 21.5-inch Retina 4K models expected.
Apple Tablet Computer Design Patent
Readers will recall that many of the same images were revealed in August 2004 (images).
The patent application images this time also depicts a person using the device as a tablet with touch screen (image). Little other information is offered on this potential design.
Of interest, this is not the first time Apple has worked on a tablet based computer. An early prototype Newton is pictured here (Messageslate) as well as a tablet-based PowerBook prototype pictured here.