Sources familiar with the plans have told iMore that the iPhone 5S does indeed have the same basic design as the iPhone 5, with a more advanced processor and an improved camera. With the iPhone 5, Apple reduced the thinness of the casing but managed to keep essentially the same, if not slightly better, overall quality. Given the dimensions, or lack-thereof, that in-and-of itself was a feat of engineering. With the iPhone 5S, the aim is to once again raise the bar in terms of iPhone optics, including a much better camera in essentially the same casing.
Additionally, the site has been told the Apple is planning to release new iPads in April.
We've also been told an April-ish launch is getting serious consideration for the next-generation iPads, but we're really not sure what to make of that yet. iPad 5 casings have already begun to leak -- the only big redesign in the line -- so that could make sense. Retina for the iPad mini, however, still doesn't sound imminent.
Notably, the idea of a summer release for the iPhone 5S was just put forward by KGI Securities analyst Ming-Chi Kuo. In a recent investor note, Kuo predicted that Apple would announced the iPhone 5S in June and release the device in July.
It's believed that Apple may be accelerating its release schedule for the iPhone to prevent upcoming devices such as the Samsung Galaxy S IV from leaping ahead in features.