Hi, I tried with new Xcode version 5 developer preview. I have few things to tell about Xcode 5. you can see below images as well. We can see new images entry for App icons and launch images, titled with iOS 7 Retina. For now we have three type of images for Default.png, Default@2x.png and Defaultfirstname.lastname@example.org. Now it’s clearly show there is another image going to come something like this Default-[SOMETHING_HERE]@2x.png.
You can see there is new tab for Capabilities. We can just enable features like iCloud, Game Center, Passbook, In-App Purchase, Maps, Background Modes, Keychain, Inter-app Audio and Data Protection by one click. Few features need you developer account and it will enables it, and adds all required libraries and info.plist entries.
We all know that iOS 7 UI get big change. Please check with below mail app. In iOS6 row icons really cool and in iOS7 those are in blue color. So, we need to use two different for iOS 7 blue plan and flat icons.
It seems we need to worry much about UI. Because we can add new set of images for iOS 7. There are many more feature in API level as well. Lets wait and see it still Xcode in beta (Developer preview).