Apple unveiled iOS 5 at WWDC 2011 with amazing new features and is available for a download for developers.
iOS 5 has 200 new features and over 1500 new APIs for the developers.
Developers who are enrolled in the iPhone Developer Standard or Enterprise Program can download iOS 5 beta.
Device supported by iOS 5:
iOS 5 will support iPhone 4, iPad 2, iPad 1, iPhone 3GS and iPod Touch 3G/4G.No support for iPhone 3G.
Registered developers can download iOS 5 beta from iOS Dev Center.