While this usually works, Facebook fails to display this virtual menu button for some reason, forcing us to live with the annoying default notification settings.
Just like in Honeycomb, a virtual menu button (represented here by three vertically stacked dots) appears to the right of the main row of softkeys when running legacy apps.
That 0.1 numbering gives a good indication of just how light the visible feature set might be, though -- other than an existing update to substitute the virtual menu button for a long-press of the home key, the interface changes are mostly limited to dedicated buttons for switching browser tabs and between different cameras.