Diablo III will pick up the story twenty years after the events of Diablo II. Mephisto, Diablo, and Baal have been defeated, but the Worldstone, which once shielded the inhabitants of the world of Sanctuary from the forces of both the High Heavens and the Burning Hells, has been destroyed, and evil once again stirs in Tristram. Playing as a hero from one of five distinct character classes, players will acquire powerful items, spells, and abilities as they explore new and familiar areas of Sanctuary and battle hordes of demons to safeguard the world from the horrors that have arisen. The first two characters classes -- the barbarian and the witch doctor -- were shown as part of the announcement at the event today in Paris.

Diablo III will feature a custom 3D-graphics engine to render lush indoor and outdoor areas of Sanctuary with a high level of detail and vivid special effects. The game's physics-enhanced environments will be interactive and destructible, offering traps and obstacles that create added danger for players and monsters alike. These elements, along with a new quest system and random scripted events, will be integrated into the game's random-level generator, giving Diablo III the ultimate combination of dynamic gameplay and replayability. Cooperative and competitive play will be available online through an upgraded version of Blizzard Entertainment's renowned online gaming service, Battle.net.

Diablo III will also include several control improvements, including full zoom capability and a hotbar to easily access skills. Players will be able to quickswap between skills using the mouse wheel or tab key.

Armor will now be class-specific, designed to provide each character a unique look. Classes themselves are more diverse, as it was noted that there will be female versions of both the Barbarian and Witch Doctor.

In a demo of the Barbarian class, the company noted that less of an emphasis will be placed on potions for health. Instead, red orb-like items will drop that immediately recover health once the player picks them up.

Environmental destruction was also shown off, with a character at one point busting through a solid wall. The environment can also be used to kill enemies, as in the case of objects that fell from a wall, killing a group of monsters.

Enemies were shown to be larger in scale than in past games, with giant evil trees and a massive demon called a Siegebreaker.