Apple has released iOS 5.1 beta 2 to registered developers. This release has a build number of 9B5127c. The most important change in the build is the ability to delete individual photos from photo stream. Something I think we all have wanted to do at least once.
NEW: Photos taken using iOS 5.1 can be deleted from Photo Stream on your device and will be removed automatically from Photo Stream on your other iOS 5.1 devices. Older photos can be manually deleted from your iOS 5.1 devices.
New versions of Xcode 4.3 and Apple TV software were also released.