We've managed to score a system dump of the Facebook phone! There's nothing in it that's too earthshattering, and you could probably guess most of the features, but, since we've got it, we might as well take a look at it.
[This is not an April Fool's joke. I promise.]
Now, this being Facebook, nothing really works unless you sign in. The problem is, all of this is pre-release, so it's set up to only work for Facebook employee accounts.