King Leoric is a boss you fight when you're between the levels 5 and 10, as per the playable demo... so I'll go ahead and wager however much pocket money your parents give you per week, times however many weeks until release.
Well, that would be if the bet was against King Leoric being the Act1 boss... but as certain as I am he isn't the Act1 boss, I can't be certain Tyrael is.
What I love about Diablo III:
+ Taking the game in a new direction
+ Random adventures as a primary form of exp-gain.
What I hate about Diablo III:
- Possibility of no LAN play!