Im gonna go ahead and post a whole load of info from the next film (gathered from movie magazines like Empire and film websites), I do hope I am not breaking any rules and please, enjoy. This is all true, assuming each author didnt make anything up...!
-The movie will be generally much darker and more serious than AUJ, much like Godfather II and Empre Strikes Back. No Witty jokes or toilet humor.
-There are quite a few action scenes which had no part in the books; for instance, after the barrel scenes (which involve Orcs AND Elves) a rather large fight takes place in a ruined, snowy Dale, where Thranduil and Gandalf (?) are present.
-This film features the investigation and attack on Dol Guldur. Empire mentions the battle is similiar to Helms Deep, only the Orcs are the defenders while Thranduils Elves and the White Council lay siege to the fortress.
-'Father and son' is a heavy theme, PJ says, with Legolas' troubles with his daddy Thranduil, Thrain and Thorin, and he mentions there being a lot of characterization between Azog and Bolg.
-Flashbacks of the battle before the gates of Moria, which explain how Thrain ends up in Dol Guldur appear.
-The movie supposedly features more antagonist characters; Mirkwood spiders, The Necromancer, Smaug, Azog and Bolg all have large roles in this story.
-PJ mentions the film concludes with a definitive confrontation between the Dwarves and Smaug, with 'bombs, infernal artillery and one mightily [word deleted] off dragon'. PJ also notes he is 'enjoying deviating from the book'.
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There you go. Discuss. MY 2 cents is, that Smaug will be dead by the end of this film, and the battle of 5 armies happens about halfway through film 3. I'm also sure Azog will make it to film 3 aswell, but this is MY opinion.