I just got the following from Apple in an email:
I also noticed that iTunes 12.0.1 is now available as an update in the Mac App Store. The iTunes update is a 218MB download.There are only minor differences between the last seed build (14A388a) and the build posted to the App Store (14A389). The full OS X Yosemite installer is available as a free upgrade in the App Store. Following installation, look for a software update for iTunes 12. If you still experience critical issues with this build, the project will remain open for your feedback.