1) Obviously find out what happened to the black soul stone.
2) Put Leah's soul to rest. It was said that she was too powerful for Diablo to corrupt her soul, even if it killed her body. My wizard character said he wouldn't rest until her soul was put to rest.
3) Kill Adria, damn traitor lol. We never even found out where she went.
4) Find out what Dirgest's jewel is for Covetous Shen lol :)
Please limit this to discussing plot points or features you would like to see in the expansion :-) Lets keep it civil and on point please.