Apple just announced the iPhone SE with a 4" display. The phone features a body almost identical to the iPhone 5 and 5s, but features the latest gen Apple A9 chip with a dual-core 1.85 GHz Twister processor and PowerVR GT7600 six-core graphics. The 4" display rocks a resolution 1136x640 pixels, resulting in a pixel density of 326 ppi. The iPhone SE also features Retina Flash, which momentarily makes the screen three times brighter when you take a selfie. The 3D feature from the larger current gen iPhones hasn't made its way to the SE though. The Apple iPhone SE features the same...
Source: http://www.gsmarena.com/apple_iphone_se_official_with_4_display_and_a9_chip-news-17344.php