Apple has released iTunes 11.0.5, intended to fix an iTunes in the Cloud related issue where “some purchased may download or play unexpected items.” In addition to the public release of iTunes 11.0.5, Apple has also posted iTunes 11.1 beta 2 to the iOS Developer Site. The initial iTunes beta added support for iTunes Radio; it is unclear what has changed in beta 2, although it presumably addresses the same iTunes in the Cloud issue as the public release.
The public release is available through the Mac App Store or the iTunes download page; the beta version is available only to registered iOS Developers via the Apple Developer Site.