iPad 2 Resolution is Likely 2048x1536
There's been a lot of talk about a "Retina" display for the next generation iPad. Based on Apple's marketing efforts for the original "Retina" display, it would suggest a DPI (dots per inch) greater than 300 to exceed the abilities of the human eye. 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. 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.