Apple's second-generation iPad mini, dubbed iPad mini 2, could have a Retina display with a pixel density of 324 pixels per inch, even higher than the iPad 4's 264ppi Retina display.Related StoriesBest place to buy a iPhone 5Apple's iPad mini 2 to have 324ppi Retina display, topping iPad 4 - report128GB iPad now available from Apple's online store
