Apple has released iOS 6 beta to developers of iOS Developer Program at WWDC 2012.
The build number of iOS 6 beta is 10A5316K and is available for Phone 4S, iPhone 4, iPhone 3GS
iPad 3/New iPad, iPad 2 and iPod Touch 4G.
Yesterday, iOS 6 Beta 10A5316k was leaked is still not working.
iOS 6 comes up with 200+ new features which includes Facebook integration,Siri now available on New iPad/iPad 3,Baidu Search,improved Siri,Guided Access, Maps with turn-by-turn navigation and 3D Flyover,Shared Photo Streams, Mail, Passbook, Guided Access.

iOS 6 beta is available only for developers so if you are a iOS developer then download iOS 6 beta 1 from the iOS dev center.
Final iOS 6 will be released in fall.
iH8Sn0w has tweeted that iOS 6 beta 1 Build 110A5316k will expire on Wednesday July 17, 2012. Hence, if you are running iOS 6 beta 1 Build 110A5316k after July 17 you will be required to update to the latest build.
Today’s iOS 6 Developer BETA 1 (10A5316k) expires on Wednesday July 17, 2012 @ 8PM EST. #TheMoreYouKnow
After releasing iOS 6 Beta 1 for developers Apple has released iTunes 10.6.3 for both Windows and Mac OS X.
The latest iTunes is compatible with iOS 6 beta and Mountain Lion and is available for a download for all.
iOS developers are required to update to iTunes 10.6.3 to install iOS 6 beta on iOS devices.

What’s new in iTunes 10.6.3
Here’s what’s new in iTunes 10.6.3 in addition to support for iOS 6 beta and OS X Mountain Lion:
Addresses a problem where iTunes may become unresponsive when syncing an iPad (1st generation) that contains an iBooks textbook
Fixes a problem where photos synced to a device may appear in an unexpected order
Resolves an issue where iTunes may unexpectedly delete playlists created on a device
Fixes issues where iTunes may unexpectedly delete apps on a device
Improves overall performance and reliability
Download iTunes 10.6.3 for Windows
Download iTunes 10.6.3 for Mac OS X