iTunes 12.0.1 and Security Update 2014-005 for OS X Released
Apple has released iTunes 12.0.1 for all Mac users, as well as Security Update 2014-005 Mavericks for those running OS X 10.9 Mavericks, and Security Update 2014-005 Mountain Lion for those running 10.8.
Mac users whom have already updated to OS X Yosemite will not find a Security Update available to them, indicating whatever patch is included in the updates for prior versions of OS X has been baked into the OS X 10.10 release.
The Security Update can be found and downloaded through the Mac App Store, or directly from the Apple website here. Security Updates require a system restart, thus making it recommended to back up the Mac before completing the update, despite being quite small. Updating to iTunes 12 does not require a reboot.
The iTunes 12.0.1 update also includes some security fixes, but what will be much more noticeable to end users are the interface changes that arrive with the newest version of iTunes.
These seemingly minor updates were largely overlooked in the availability of OS X Yosemite, but nonetheless, all Security Updates remain important for users who are running OS X Mountain Lion or OS X Mavericks to install. It would be recommended to install the updates even if you plan on updating to Yosemite sometime in the distant future.
Finally, for advanced Mac users who have the Command Line Tools installed, a separate update versioned as Command Line Tools 6.1 is also available to them through the App Store.