Hitachi and Sony are rumored to be a screen of 4 inches. True or not this still a rumor, but the expectations of fans of the iPhone is the next device should look different. Unlike the transition between the iPhone 4 to iPhone 4S.
But until now, everything is still rumor. Not yet know whether this will be used an iPhone or iPod. But definitely, this 4-inch screen will be used on devices with IOS next. Apple indeed will always make a surprise perch products introduced in the community.