Following, this week's report of Mashable that Facebook's iPad app would launch at Apple's iPhone event on October 4th. It's also rumored that Facebook is actually planning to launch the iPad app at their own iPad/Spartan event on Monday.
Also, just before the take down, Alexia managed to grab a five page Facebook's developers document that could possibly be the Project Spartan page. A statistic was shown, stating that "350 million users access Facebook from a mobile device every month," where it then continued to describe some Facebook mobile web app features as well as screenshots.
What is Project Spartan? It is a HTML5-based mobile application platform which Facebook continued to develop hand-in-hand with 3rd party developers for some time.
It does seem as though most of the app's core components such as the icons for Bookmarks, Messages, Notifications, and Friend Requests, do seem to be a one-for-one perfect match of Project Spartan.
Here are the screenshots and document:
Facebook Developers Document: