Larger preview images displayed throughout.
Sharing privacy options – share to friends, friends of friends, public, private (on you can see it) or have select groups of friends who can or can't see the post.
Improved handling of text fields when entering multiple lines of text.
Improved check-in functionality.
Widget layout & functionality improvements.
What do you think? What's the thing you'd most like to see included in future updates of Vita for Facebook?