Another picture from MacRumors shows the iPad 3 display under magnification next to an iPad 2. At the same magnification, 4 pixels (2×2) from the iPad 2’s display are being compared to the iPad 3 retina display. The 16 pixels (4×4) appear to cover the exact same area, making double the resolution. Double resolution equals 4 times the pixels!
Still waiting for the pictures of the 8-inch iPad everyone is talking about.