iTunes 12.4 arrived overnight, fulfilling the "early next week" part of Apple's undertaking.
But the release notes make no mention of the issue. They read:
Now enjoy all of your music, movies, TV shows, podcasts, and more in a simpler design.
Navigation. Now you can use Back and Forward buttons as you navigate between your Library, Apple Music, iTunes Store, and more.
Media Picker. Easily switch between Music, Movies, TV shows and more - and Edit to choose just the items you want.
Library and Playlists. Use Sidebar to view your Library in new ways. Drag and drop songs to easily add them to Playlists. And Edit Sidebar to show only your favorite views.
Menus. Menus in iTunes are now simpler and easier to use. Use the View menu to customize your Library or try context menus to act on specific items.
In particular, iTunes 12.4 removes the hidden selection of categories such as podcasts, apps and audiobooks with a more conventional pop-up menu.
The new version is available via the Mac App Store or Apple's website.
The Windows version of iTunes 12.4 addresses a dynamic library loading issue that could lead to arbitrary code execution.