Lots of people saying they wish they had Retina Display on iPad. Obviously iOS 4 won’t do that. :-) But I don’t mind. iPad display’s fine.
OK, the iPad’s screen is 1024x768 @ 130dpi. Physical dimensions work out to 7.88”x5.91”.
Those same dimensions at 326 ppi would result in 2568x1926 pixels — more than my current 30” Cinema Display (2560x1600).
Thus, between the display, memory and graphics processing requirements, we’re not getting a iPad + Retina Display any time soon.