Apple today released a new version of the iTunes 12 beta for both developers and OS X Yosemite beta testers, following yesterday's iOS 8 Golden Master release. Yesterday, users reported having difficulties installing the iOS 8 GM from Yosemite with the iTunes 12 beta, and this update may fix the issue.
iTunes 12 also includes improved playlists, a redesigned Info Window, and a new icon. iTunes 12 and OS X Yosemite remain in a beta testing phase, with a public release for the software expected this fall, possibly in October.
Article Link: Apple Launches New iTunes 12 Beta for OS X Yosemite