Heart of Fear is a new raid level that's currently playable on Normal difficulty level, with Raid Finder and Heroic difficulties to follow. According to Blizzard, "Raid Finder will unlock bosses in Heart of Fear over time, and all Heart of Fear bosses will be unlocked and available November 14th. To access the new Raid Finder dungeons, you will need a minimum item level requirement of 470."
Blizzard have staggered the release for Heart of Fear and Terrace of Endless Spring over the next three weeks, according to this schedule:
- October 31st: Heart of Fear at Normal level.
- November 7th: Heart of Fear at Heroic level, the first half of Heart of Fear on Raid Finder level.
- November 14th: The second half of Heart of Fear on Raid Finder. Terrace of Endless Spring at Normal.
- November 21th: Terrace of Endless Spring at Raid Finder and Heroic levels.