Diablo III: Reaper of Souls Collector's Edition includes:

• Malthael mouse pad, bearing the impenetrable visage of the Angel of Death
• Hardback Collector's Edition art book, chronicling the game's artistic development
• Behind-the-scenes Blu-Ray/DVD two-disc set, featuring in-depth interviews with the development team and members of the Diablo III community
• A collection of exclusive helm- and weapon-transmogrification recipes to distinguish your hero among the champions of Sanctuary
• A loyal Spectral Hound minion to keep your adventurers company on their epic journeys
• Three additional character slots to accommodate new heroes
• An in-game Treasure Goblin companion pet for World of Warcraft
• An assortment of Crusader-themed Battle.net portraits and Malthael-themed decals for StarCraft II.

This new installment in the series is being described as a “feature-rich expansion.” Reaper of Souls introduces the new Crusader class which brings the total of playable classes to six, an increased level cap to 70, a new act and new reigning enemy Malthael.

Reaper of Souls will also feature new monster types. This includes the range casting Seraphs, the summoner of the dead, the hulking Executioners and the fallen Death Maidens. In the tradition of the Diablo series, the new Westmarch environment will be entirely randomizable, and this is where players will begin their trek.

Fighting these new enemy types is The Crusader class, described as a mid-range melee class whose combat style is centered around shields, flails and mid-range spells.

The game also introduces a new artisan, the mystic, who is able to both transmogrify items which changes their appearance and enchant them which re-rolls their affixes.