Apple announced iOS 8 earlier today with many new features. It sounds like the cut-off for the devices that will be able to download the new operating system is the iPhone 4S. This means that iPhone 4 and below owners are out of luck here. This is based on details on the iOS 8 website. iOS 8 will work on the iPod Touch 5th gen and the iPad 2 and above. iOS 8 is expected to arrive this fall along with a next-generation iPhone.