Heart of Fear

Heart of Fear is a game update believed to be planned for 2013. It is "Part 3" of Rain of Fear. It is likely to be Tier 4 of Rain of Fear.

I would not expect Chelsith Reborn and Plane of Shadow [Shadow of Fear] to be the last thing you see this expansion [Rain of Fear].

Details
Heart of Fear will be likely to feature one additional zone, a version of the Plane of Mischief.

Zones

 * Heart of Fear (zone)
 * Plane of Mischief - This is expected to be a high end altered version of the current Plane of Mischief.