Just as it was expected Apple has also released Xcode 5.0 along with iOS 7.0 update. The new Xcode 5.0 is available for download through the dev center and Mac App Store. This new and updated version of Xcode brings support for iOS 7 and also includes a 64-bit app compiler for the 64-bit processor found in iPhone 5s.
This new version of Xcode includes SDK for OS X Mountain Lion and iOS 7. Other important features include Automatic Configuration, Test Navigator, Test Assistants, Preview Assistant, Auto Layout in IB and more.
The new Xcode is a 1.96GB download and may take a while to appear in the Mac App Store. You can download it from dev center if you want to but that could take a while to download due to iOS 7 release.