Looks like Facebook Page Tabs are gone, or mostly gone
The feature of Facebook Pages that allowed you to create your own custom page tabs, which has been repeatedly deemphasized in the last several redesigns, looks like it will vanish or nearly so. At one point, you could create a welcome tab urging people to like your page before they could even see the stream of posts. That's been gone for a while, although you could still have tabs that showed different messages depending on whether or not people liked your page.
Now, the row of icons below the cover image that pointed to page tabs has been wiped out, although I'm told it will still be possible to navigate to them through some less prominent navigation element. Not live on my pages yet.
Sad day for me. One of my minor claims to fame was that I created a Facebook Tab Manager for WordPress, a plugin for managing tab content with the tools of that blogging system. But tabs are one of those features that have been fading in importance as Facebook maneuvers businesses away from free tools available on its platform to paid advertising.