Diablo 3 - Tidbits @ Starcraft Legacy

Gamebanshee posts a link to Blizzard fansite Starcraft Legacy where this factoid on a new game feature, randomly generated adventures, is mentioned in some of their WWI coverage:

There is also a focus on maintaining the random aspect of the original Diablo games. This includes, in addition to random loot, dungeons and monsters, a new feature called "Adventures". This is a system in which the developers have managed, via a clever piece of programming wizardry, to create completely random scripted events within a game world. For instance, were you passing through a forest, you may happen upon a clearing where evil cultists had begun to summon particularly deadly foes. This wandering, and thus finding of these random events, encounters and delicious loot, will be assisted by an "opt-in" style of storyline, where a player can avoid or participate in the storyline as much as he wishes.