The update has a build number of 10A5376e, and weighs in at 282mb for the 4S.
Along with the new beta, Apple rolled out Xcode 4.5 Developer Preview 4 for developers which is available in the dev center as well.
If you find anything new, please let us know in the comments below. We will keep you posted on any major changes found.
Apple is expected to release the final version of iOS 6 this fall, with the current rumored date around September 21.