Accessory vendor Spigen has created renderings of a work-in-progress case that it designed for Apple's upcoming 'iPhone SE'. Spigen often has some of the first cases available for new iOS devices so assuming they know what they're doing here, it could be concluded that the upcoming iPhone SE might be virtually indistinguishable from the iPhone 5s.
The rumor-mill is in disagreement over the design of the iPhone SE, with one camp claiming the handset is basically a four-inch iPhone with an iPhone 6/6s-like case and the other insisting the device will feature an iPhone 5s-like look and feel.