As you may have already noticed new Harmattan 1.2 release is available for your N9 in some coutries.
It updates PR 1.1 and PR 1.1.1 (arabic version) harmattan releases.
List of changes is not available yet but it will be available soon.

BTW most of changes are listed here:

If you don't see any update message on your N9, then you should read this article: