At last, the Facebook application for the Zune HD has been released. It has elements of the Metro interface that Microsoft is utilizing on Windows Phone 7 Series devices, and so looking at the this rendition of Facebook, we can get a sense for how other apps would look on WP7.
As you can see, the Facebook app makes use of the Metro UI application bar on the bottom of the screen. This area shows you commonly used menu items, though you can slide it up to reveal more advanced options.
In this view we can see the use of large numbers in a plain font…a style that is used commonly in the Windows Phone 7 Series interface.