That Panasonic 20" is getting my hopes up (even though it is an N-trig stylus).
http://dvice.com/archives/2013/01/panasonic-shows-2.php
@Travissimo, my modbook has been gathering dust. I was using it quite a bit at the beginning but the bezel around the screen and the thickness of the tablet made sketching pretty frustrating. The size of the screen feels pretty cramped too.