The PS3 version of Honest Hearts has been delayed due to the PSN downtime. It was announced on the offical Fallout Facebook Page.
Here is the offical statement:
Honest Hearts will be available on Xbox LIVE and Steam tomorrow, May 17th – as originally planned. However, the add-on pack for PlayStation 3 will be delayed due to recent issues surrounding the PlayStation Network. As soon as we have more information on when it will be available we will let you know.