The new setting is within the security settings and allows you to "auto reactivate" your account after a set period of time. Your not-deactivated-deactivated account can still get tagged in photos, and friends can even interact with your ghost town of a wall. But Facebook knows you'll be back. THEY ALL COME BACK.
From the Huffington Post:
If a Facebook friend posts something that you feel indicates he or she could be thinking about self harm, you'll be able to click the little arrow at the top right of the post and click "Report Post." There, you'll be given the options to contact the friend who made the post, contact another friend for support or contact a suicide helpline, the University of Washington reported on Wednesday.
After that, Facebook will look at the post. If Facebook feels like the post indicates distress, it will contact the person who posted it. That person will be greeted with the following pop ups when he or she next logs in.