DiabloFans

I think he should die, revealing a secret he kept for say...40+ years (since D1)..Before you go to final boss in game this happens and he gives you whats left of his powers to help you defeat 'insert name of boss here'. (You unlock a skill tree with like 2 or 3 skills and you can only put 1 point in this tree throughout the whole game. )

This definately opens many story opportunities..but blizz wants to start closing the diablo story (Start crying now..) I say one more release either minor or major after D3 expansion.

I think a really good twist on the story. They have cain die in like the beggining or something. Then later on you see cain again. You see him as undead. What could happen is the necro from d2 raises him as a zombie. (The guys from d2 are insane right? Except the barb?) The Necro in his insanity remembers cain and uses a spell to bring him back as a zombie. Cain tries to help the necromancer but he walks away. Then later on your character meets cain standing outside of town. (I think he should be a bloody mess though maybe the demon who killed him did a nice job of ripping him apart.) So you see cain he looks like a zombie but he still wants to try and help you. idk lol im just throwin stuff out