Images accidentally left in iBooks 1.1 and 1.2 reveal that the iPad 2's resolution is likely double that of the current model, according to MacRumors.
Version 1.1 of Apple's iBooks application seems to have accidentally included some artwork for this hypothetical pixel-doubled iPad. As shown above, the App's bookmark icon included versions for the iPad, the iPhone and the iPhone Retina Display (iPhonex2). It, however, also included one additional version labeled "iPadx2". Sure enough, this is exactly double the resolution version of the iPad icon and is distinct from the other versions. The most likely explanation for this added graphic is plans for a double-resolution iPad. Apple has since removed this extra artwork in subsequent versions of iBooks.
The current iPad uses a 1024x768 resolution. Doubling this resolution would result in a 2048x1536 resolution at a 260 DPI.
A recent Engadget report also predicts a "super high resolution" iPad 2.
Nice! I suppose 260dpi, being below 300dpi, the self-imposed "retina standard" of Steve Jobs at the introduction of iPhone 4 technically falls 40dpi short. lol
That's plenty close enough for me, though, and obviously, they will likely keep the LED-backed IPS LCD technology and with that, my own personal appetite for super hi-resolution, high-quality displays will have been met, and then some. :-D
Can we do the iMac next? 5120x2880 at 27"? Please?