Just recently, Apple released an all new iTunes 12 beta update for the new OS X 10.10 Yosemite. This new beta version was likely released due to some errors and issues from installing the iOS 8 GM, which was released this Tuesday. The new iTunes 12 beta can be downloaded for those who have OS X 10.10 Yosemite beta. Apart from the update issue, nothing has really changed from the last beta.
iOS 8 will be released to users and the public on September 17th. It was released along with Xcode 6 GM.