The screen resolution in the iPad 3 is expected to increase, from the iPad 2's 1,024x768 pixels to 2,048x1,536 pixels. That's from 786,432 pixels to 3.14 million.
Rumor has it that Sharp may be supplying the LCD panels, which will offer QXGA resolution with a pixel density of 264 ppi (300 ppi is considered a Retina Display). By comparison, the pixel density of the iPad 2's screen is 146 ppi. That's obviously a big jump if those numbers end up being real.