Rumor today that the next iPad will have a seven inch screen. Let’s think about that for a moment.
Everybody has been wondering when the iPad will get the Retina display that the iPhone 4 has. Well, if you assume that the iPad Retina display will be constructed out of four iPhone 4 displays (2×2) then you get to 7 inches. But doing that will yield an iPad 2 display that has a resolution of 1920×1280, a 1.5 aspect ratio, the same as the iPhone.
Changing the aspect ratio of the device might mean that apps need to be rewritten.
If Apple were to use Retina display technology but retain the current screen size of 9.7 inches, then the display would have a resolution of 2558×1919 pixels, which may just have been outside the budget for this iteration.