Apple just launch iTunes 10.1 Beta available at Apple`s store from 28th sep

iTunes 10.1 Demo version  is available for download on Apple’s Developer portal site. And there is a reason out why the download bits got available to the diligent developers
"This is a pre-release version of  iTunes 10.1 beta to support testing of printing from your iOS app. Be sure to backup your iTunes content prior to installing iTunes 10.1 beta."