Diablo III Questions Blizzard Must Answer

List time; a list of questions Blizzard absolutely must answer in regards to Diablo III.
10. What the hell happened after the end of Diablo 2?

Blizzard has done a wonderful job of getting information out at the same time as announcing Diablo 3. Here it is straight from the horse's mouth: "It has been twenty years since the events of Diablo II. Of those who faced the Lords of Hatred, Terror, and Destruction in the battle over the fate of Sanctuary, there are few still living who can bear to remember the horrors that the Prime Evils wrought upon the world. And of those who did not witness the terrible events firsthand, most believe the stories to be little more than myth. But something evil is stirring once again in Tristram, and it may already have claimed its first victim: Deckard Cain." That's great and all, but there are befuddling story questions that have us stroking our beards feverishly. Following the destruction of the Worldstone at the end of Diablo 2: Lord of Destruction, why wasn't there a swarm of the demons? Where are Diablo's brothers, Mephisto and Baal? What happened to Diablo? Gaaaah!