Facebook has just updated its iOS app adding a notable new feature, just don't expect to be getting Facebook Home. This new iOS app has some minor changes but the notable feature is Chatheads. You can now use Chatheads in the app, but only in the app. Because iOS is pretty limited compared to Android, you won't be able to take Chatheads around with you wherever you are on your device.
The iPad version of the app has also been updated to just look a but cleaner and organised. Previously it just looked like a blown up mobile version.
Other than that, you'll notice some other minor changes such as new buttons, new options and minor UI tweaks here and there.