[Update: As jbruni commented below, as of Monday, 1/27, Apple has enabled this feature.]
Late on Wednesday Apple released an update to iTunes, version 11.1.4. In addition to the "stability improvements" common in most release notes, yesterday's update reported "This version of iTunes adds the ability to see your Wish List while viewing your iTunes library." The thing is, we can't find it and neither can anyone else.
Wish List is still available by going to the iTunes Store, clicking the "Home" tab (the one at the top in the shape of a house) and then choosing "My Wish List" from the Quick Links section on the right. It's also available by choosing the "hamburger" menu in the upper right corner of the window when in the iTunes Store section, but that was there in 11.1.3 and is not new to iTunes 11.1.4 (we checked).
As Macworld has, we've reached out to Apple for clarification.