Dol Guldur
 

I think it's a given that the Dol Guldur/Necromancer arc will be included in either of the two Hobbit films. Given that Tolkien was very sketchy on details, how do you think should play out? 'The devices of Saruman' planted around to help drive out Sauron should be interesting. And maybe throw in a magic duel between Saruman/Gandalf/Sauron? Think Dumbledore vs. Voldemort in Harry Potter 5.

I also think it is likely that they will include it; I think it would be interesting to see a three-way wizard duel, even if we already know the outcome. If they do feature a White council story-line I hope they bring Christopher Lee back as Saruman. If they do show Dol Guldor I wonder if they will make it bear some resemblance to the buildings of Mordor (such as barad'dur).