If this 3x res is applied to the current iPad Air it'll give 594ppi! Even to me that sounds a little like overkill res-wise. And I like my Retina displays! But if you apply that 3x res to the rumoured large screen iPad Pro - at 12.8" that works out to exactly 300ppi or print quality. Or if its the rumoured 12.9" then just over 297ppi. Anyway this new info adds much more interest to the upcoming 16th October event.