Together with the GM seed of iOS 4.3, Apple has updated the developer center with a new build of Xcode 4 GM. The “seed 2″ available for developers includes performance and stability improvements.
The first Xcode 4 GM seed was released in February. It included support for submitting iOS and Mac apps to the App Store and brought along the impossibility to build apps for OS X 10.5 Leopard. Xcode 4 is a major new version of Apple’s development suite which sports lots of new features
and a new single-windowed UI.