Wacom has released the Cintiq 13HD.It is $999. I has a 1920×1080 display that runs off of hdmi and usb, and has a resolution of 5080 lines per inch.
I would so love one of these, but they are just too expensive. I do love the rumor of a Wacom tablet though, as having a portable tablet that is also a Cintiq sounds amazing!