This is the complete Xcode developer toolset for Mac, iPhone, and iPad. It includes the Xcode IDE, iOS Simulator,
and all required tools and frameworks for building OS X and iOS apps.
Xcode 4.4 Developer Preview requires OS X Mountain Lion.

Installation
This preview release of Xcode 4.4 is distributed as a single application bundle, Xcode.app.
Upon final release in the App Store, this will enable developers to easily download Xcode directly.
During the preview period, to install Xcode.app, double-click to open the downloaded DMG file, and drag the Xcode.app file to your

Applications folder.
Within Xcode, you can launch additional developer tools, such as Instruments and FileMerge,
via the menu item Xcode> Open Developer Tool. You can then keep the tool in your Dock for access when Xcode is not running.
Not all of the tools previously included in the Xcode installer are bundled in this preview release.
This preview release includes Unix development tools for OS X 10.8 placed in / usr.
You can download these tools, now known as the Command Line Tools, from Xcode preferences.
Look for the them in the Components tab of the Downloads preferences pane.

New Features in Xcode 4.4
Scene Kit
Xcode now includes a viewer and editor for 3D files as. DAE documents.
New Interface Builder Support for AppKit Features
Xcode's Interface Builder includes support for new AppKit features like trackpad zoom support and auto-layout.
LLVM 4.0 Compiler
Xcode now includes the Apple LLVM Compiler version 4.0, including the following new Objective-C language features:
• Default @ synthesize: automatically synthesizes an @ property when unimplemented
• Objective-C literals: create literals for NSArray, NSDictionary, and NSNumber, just the same as the literals for NSString
• Objective-C container subscripting: use '[]' syntax to access containers such as NSArray and NSDictionary