Today Apple quietly released iOS 5 beta 3 and Xcode 4.1 GM for MAC OS X Lion which is said to be coming later this week.

According to macstories the changes are as Follows:

Xcode 4.1?s Interface Builder includes support for new Aqua controls such as NSPopover, Full screen support in the Xcode workspace (for full screen apps), and project modernization that can automatically fix errors caused by improper build settings.