I have the latest version of Xcode. In one of my projects I noticed that the views for the iPhone were the new iPhone 5 screen sizes. I like it but is there a way to switch back to the smaller screen size? Not everyone has the iPhone 5.
Also, when your building your interface, you'll see a small icon that lets you quickly switch between 4" and 3.5" screens. It's the rectangular icon on the left. It toggles back and forth between phone sizes.