As SC2 was nothing special, I think that D3 will be the same - so much hype, because the previous two games were fantastic (I remember having D2 in my dreams) and when it comes out everyone will be disappointed, because:
1. the game has been made too easy
2. it's not as dark as it used to be in the previous two - I remember being scared in the first act of Diablo II, just in the beginning (let's point out that I used to be around 10 back then, if not younger). And when I got to the catacombs, I was already freaked out as hell.
Diablo III, happens to look so infant-friendly it almost kills the fun of it, and it strays from the story, as the story used to be dark and so on.