updated 05:30 pm EST, Thu January 19, 2012
iBooks 2 includes 2X graphics for 2048x1536 iPad
A quick search of the assets for iBooks 2 has all but cemented the likelihood of a 2048x1536 iPad 3 display. Along with including iPhone and regular iPad sizes for its individual images, the new app includes "iPad@2x" artwork for the book cover, BGR noted. Other assets also mention "2x," although Apple sometimes doesn't need to mention which device the resolution is for.
Earlier iOS 5 art assets had similarly occupied resolutions that could only have been for a future iPad.
A higher resolution display was considered probable given advancing technology from rivals, the quad-core graphics needed to drive high resolutions, and the increasing importance of reading in Apple's strategy. Apple has been more elusive on the subject until now and may have had its hand forced by a possible iPad refresh in March that would require all its core software be updated to take advantage of the improved display.