Just to go on the record: If and when an iPad mini comes I predict it will have the 1024x768 @1x resolution cramped into that smaller display area. It will have slightly higher DPI than the original iPad/iPhone, but it won’t be Retina. All iPad apps will just work. All iPad apps that disregarded Human Interface Guidlines and made their buttons too small will have issues. All others will be a little bit more intricate to handle than on the iPad/iPad2, but be fine overall.