Xcode 4 GM Released for Developers
According to early reports, XCode 4 GM allows developers to submit iOS and Mac apps directly to their respective App Stores. Other improvements include:
Xcode 4 has a brand new, single window interface for all major workflows
Interface Builder is now integrated within the main Xcode IDE
Assistant shows a paired editor with complementary files (headers, UI controllers, etc.)
Fix-it highlights code where an error is detected, as you type, and can even fix it for you
Version editor shows a live comparison through SCM history, using Git or Subversion
LLVM compiler 2.0 includes full support for C, Objective-C, and now C++
LLDB debugger is faster, and uses less memory than the GDB debugging engine
– see notes below on how to enable the LLVM compiler or LLDB debugger
Instruments adds System Trace, and new iOS instruments including OpenGL ES
XCode 4 requires Mac OS X 10.6 to install, if you are a developer you can get the GM release from Apple’s Developer Center.
Update: That came and went quick, Xcode 4 GM build has now been pulled.
Update 2: Xcode 4 GM is back again for downloading from Apple’s Dev Center.