Replying to question 4 of how Diablo will return. I think everyone is speculating on this, but I think he will manifest through Leah. In Diablo 1 the warrior Aiden defeats Diablo, by that time he was already corrupted, and was led to think that the only way to contain the Lord of Terror was to to consume Diablo's soulstone by stabbing himself in the head with it(ouch...). Aiden and and Adria(Leah's mother) had a relationship, or so it was believed. So I think that Aiden and Adria had sexy time whilst he was perhaps already corrupted and so he made a (corrupted) child,(Don't know how else to put that). So I think, but I could be totally wrong, that over time as Leah digs deeper and comes to more understanding of the Black Soulstone and all the other stuff going on, Diablo will start to manifest inside her. Well there's my 2 cents
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