http://www.reghardware.com/2011/05/1...etina_display/
"E Ink and Epson are to jointly develop a electronic paper panel with a "retina display" pixel density... almost.
[...]
The E Ink / Epson screen will have a 300ppi, but even that will make the current Kindle's 167ppi look low res.
It'll be bigger, though: an iPad-like 9.7in to the Kindle's six. The new screen's resolution will be 2400 x 1650, and monochrome.
E Ink will develop the display itself, Epson the chip that controls the screen.
Neither firm said when the screen will appear in e-book readers you can buy.